rapid flashing application guide · 14 roof outlets 16 ridge saddles 18 lead rolls 20 open valleys...

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Illustration header

RAPID FLASHINGApplication Guide

2 3

4 General working rules6 Joints8 Side abutments10 Top edge abutments12 Chimneys

14 Roof outlets16 Ridge saddles18 Lead rolls20 Open valleys

Rapid Flashing is easy and quick to install, giving consistent application and peace of mind with the Redland Rapid Flashing guarantee.

Rapid Flashing is a simple alternative

to lead for the majority of pitched

roof applications. Rapid Flashing’s

self-fusing capabilities remove the

need for difficult welding and boss

details. Rapid Flashing is a non-toxic

product. This removes the need for

regular blood tests that are required

when working with lead.

Rapid Flashing’s unique properties

offered by its polyisobutylene

coating and aluminium mesh

structure allow most roof details to

be completed using longer lengths

and smaller overlaps laps than lead,

providing a cost effective aesthetic

alternative.

Contents

Features• Appearance of lead, grey colour

• Lighter weight than lead and

easy to use

• Can be moulded quickly and

easily, without the need for

special tools

• Manufactured from

environmentally-friendly materials

• Insensitive to extremes of cold

and heat (-40ºC to 100ºC)

• UV resistant

• No scrap value means RAPID

FLASHING is not at risk

of theft

• 20 year product guarantee

• Unrivalled speed of installation

means flashing details can be

completed up to twice as fast

as standard practice

• Easy to achieve an outstanding

flashing detail

• Self-fusing capabilities remove

the need for welding and

boss details

• Easy handling and storage

• Dirt resistant surface

• Low site waste due to ease of

cutting and simple fixing

• In use on pitched roofs

since 1991

Covered by a BBA Certificate for use on pitched roofs.

It is also accepted by the NHBC and Zurich Insurance

PRODUCT SIZES

ACCESSORIES

Code Size Weight Rollsper Box

9953 140mm x 5m 2 kgs 2

9960 180mm x 5m 3 kgs 4

9955 280mm x 5m 5 kgs 4

9956 280mm x 10m 10 kgs 2

9957 370mm x 5m 7 kgs 3

9959 560mm x 5m 10 kgs 2

Code Product

9930 AdditionalButyl Strip (20mm x 2m)

9994 Rapid Flashing Roller

9998 Rapid Flashing Strip (5 x 2m)

9995 Rapid Flashing Sealant (310ml)

9929 Rapid Flashing M-Glue (290ml)

4 5

General Working Rules

Rapid Flashing is able to form most roof details quickly, using simple tools only. It also avoids the need for difficult welding and boss details.

ToolsOnly a pair of scissors or a Stanley-knife is required for cutting Rapid Flashing. A roller (9994) is recommended for joining pieces of Rapid Flashing. Do not use a hammer to form the Rapid Flashing, the force of your fingers is

sufficient coupled with a roller.

SurfacesRapid Flashing should be installed in dry conditions for best results. If laid on damp surfaces ensure that Rapid Flashing is first fixed to surface using M-Glue. This will hold the Rapid Flashing in place until the surface dries out allowing Rapid Flashing to adhere to dry surface.

Prevention against wind upliftThe integrated Butyl-strips on Rapid Flashing ensure a weathertight seal on the roof. The Butyl-strip will also prevent wind uplift. Where Rapid Flashing is chased into brickwork or other walls, use wedges and Rapid Flashing Sealant (9995) to fix and seal the free edge.

Joining / Elongation• Joining two pieces just overlap the

material by min 30mm.• For good connection use a roller. • Due to the self-fusing properties a

strong join will be formed.• There is no glue or other

additional treatment necessary.

Rapid Flashing’s self-fusing properties with integrated Butyl Strips and range of accessories such as Rapid Flashing Strip and Sealant make joints easy to complete.

Joints

Bead of Rapid Flashing Sealant.

Butyl strip – Built-in or separate.

Screws to suit substrate. Use all holes.

Rapid Flashing Strip.

Rapid Flashing dressed closely to wall.

10mm

25mm

Rapid Flashing wedge made to suit joint, and driven in with a wooden plugging chisel. Ensure Rapid Flashing is not damaged.

Rapid Flashing Sealant

30mm min lap

Press layers firmly together to ensure self adhesion

20mm

20mm wide folds are required to form welt. Press layers firmly together to ensure self adhesion. For a more secure welt, or where specified, adhere to substrate with butyl strip.

Rapid Flashing Strip

Rapid Flashing Joint

Rapid Flashing Overlap

Rapid Flashing Welt

Application (mm) 140mm 180mm 280mm 370mm 560mm

SideabutmentsTraditional step flashings (Flat) •Traditional step flashings (Profile) • •Soakers •Stepped wall flashings •Secret gutters (Flat) •Continuous wall flashings •Continuous flashings (Flat) •Continuous flashings (Profile) • •Side abutment gutters •

TopedgeabutmentsNon-ventilated •Ventilated •

ChimneyBack gutters •

Roofoutlets •

SaddlesforjunctionsRidge saddles •Lead rolls (Bonding two roofs) •

Pitchedopenvalleys •

OtherSprockets/Mansards •Vertical Tiling •

RECOmmEnDED ROll wIDThS

Note: Assumes house with conventional construction (rendered or non-rendered brickwork/blockwork masonry) with roof of pitch 30o- 45o in normal UK exposure conditions. For other situations, please contact Redland Technical Solutions, or see DesignMaster CAD details.

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Traditional Step and Cover Flashing - Flat Interlocking Tiles

Trussed rafter.Redland GRP Secret Gutter.

38 x 38 S.W Nogging.

Underlay.

Half Slate Pair (4263).

50 x 25mm S.W. batten.

Rapid Flashing 370mm (9957) (with top edge including butyl strip removed) step and cover flashing 25mm into brickwork (see detail), under cavity tray (where required or specified). Flashing to dress over slate by not less than 120mm, and be properly adhered to slate with built-in butyl strip. Rapid Flashing to be laid in accordance with Redland Fixing Instructions.

Slate (4261).

Cavity tray.

65mmmin.

85m

m s

tep

flash

ing

Gap: Nominal 2mm to 15mm

maximum.

Trussed rafter.


Rapid Flashing 370mm (9957) or 560mm (9959) (depending on how tiles are cut/positioned at abutment) (with top edge including butyl strip removed) step and cover flashing 25mm into brickwork (see detail), under cavity tray (where required or specified). Flashing to dress over tile by not less than 150mm and a complete pan and crown of the profile, and be properly adhered to tile with built-in butyl strip. Rapid Flashing to be laid in accordance with Redland Fixing Instructions.

Underlay.

Double Roman tile.65mmmin.

20mmmin.

85m

m s

tep

flash

ing

Cavity tray.

Traditional Step and Cover Flashing - Profile Tiles

RAPID FLASHING SOAKER SIDE ABUTMENTPL00SDEK

Underlay turned up wall by at least 75mm

50 x 25mm S.W. tiling batten

Trussed rafter

Trussed rafter.

Cavity tray.

55mmmin. lap.

85m

m s

tep

flash

ing

50 x 25mm S.W. tiling batten. Underlay turned

up wall by at least 75mm.

Redland Plain Tile-and-a-Half (6159) nom 2mm to 5mm from wall.

Redland Plain Tile (6151) nom. 2mm to 5mm from wall.

Rapid Flashing 140mm (9953) soakers dressed closely up wall to at least 60mm above tile line, and extend at least 65mm under tiles. Adhere to tiled and wall with built-in butyl strip, and ensure good seal (use Rapid Flashing Sealant (9995) at any gaps). Ensure that soakers are pressed tightly together against wall.

Rapid Flashing 280mm (9955/6) (cut down centre to form two 140mm strips, each with butyl on one side) step flashing to lap soakers upstand by 55mm. Allow 85mm to cut step flashing angles.

Traditional Step Flashing - Plain Tiles

Rapid Flashing on flat interlocking tiles

Use a step and cover flashing turned up the wall by approx 150mm, and covering the tile surface by a minimum of 120mm. When using flat interlocking tiles a GRP secret gutter should always be used in conjunction with the flashing.

Rapid Flashing on profile tiles

Use a step and cover flashing turned up the wall by a minimum of 150mm and extending over the tile surface by a minimum of 150mm ensuring at least one pan and roll is covered.

Rapid Flashing on plain tiles or double lapped slates

Plain tiles or slates should be covered with Rapid Flashing soakers and a stepped cover flashing. Soakers should be cut from Rapid Flashing and shaped so they run 65mm up the wall. The soaker should not show beyond the length of the tile or slate. Cover the soaker upstands with a step flashing by a minimum of 30mm.

For wall constructions where masonry cavity trays are required, traditional step flashing details can be formed using Rapid Flashing.

For side abutments where cavity trays are not needed straight continuous flashings can be installed with either the top edge chased into a raking slot or finished using Rapid Flashing Strip.

Traditional Stepped

Side Abutments – Overview

8 9

60mmmin.

upstand.

55mmmin.lap.


Rapid Flashing 140mm (9953) soakers dressed closely up wall to at least 60mm above tile line, and extend at least 65mm under tiles. Adhere to wall and tiles with built-in butyl strips, and ensure good seal (use Rapid Flashing Sealant (9995) at any gaps). Ensure soakers are pressed tightly together against wall.

Trussed rafter.




Rapid Flashing to lap soakers by at least 55mm, ensuring that bottom edge does not extend below tile line and that top edge extends above soakers sufficient to properly fix the Rapid Flashing Strip. Adhere to masonry and soakers with built-in butyl strip.

Bead of Rapid Flashing Sealant (9995) in accordance with instructions, to properly seal between Rapid Flashing and Rapid Flashing Strip, and between Rapid Flashing Strip and wall. Rapid Flashing Strip (9998) fixed in accordance with instructions with screws suitable for substrate. Screw holes sealed with Rapid Flashing Sealant (9995).

Continuous Flashing, Strip - Plain Tiles

Trussed rafter.




55mmmin.lap.

60mmmin.upstand.


Rapid Flashing 140mm (9953) soakers dressed closely up wall to at least 60mm above tile line, and extend at least 65mm under tiles. Adhere to wall and tiles with built-in butyl strips, and ensure good seal (use Rapid Flashing Sealant (9995) at any gaps). Ensure soakers are pressed tightly together against wall.

Rapid Flashing 140mm (9953) (with top edge including butyl strip removed) to lap soaker upstands by at least 55mm, and adhere with built-in butyl strip. Top edge turned into chased 25mm deep x 10mm wide slot (see detail).

Continuous Flashing, Chased - Plain Tiles

Continuous Flashing, Strip - Flat Interlocking Tiles

Trussed rafter.

Redland GRP Secret Gutter.38 x 38

S.W Nogging.

Underlay.

75mmmin.


Rapid Flashing 280mm (9955/6) cover flashing, dressed over slate by not less than 120mm, dressed up wall by not less than 75mm, properly adhered to slate and wall with built-in butyl strips. Rapid Flashing to be laid in accordance with Redland Fixing Instructions.

Rapid Flashing Strip (9998) fixed in accordance with instructions with screws suitable for substrate. Screw holes sealed with Rapid Flashing Sealant (9995).

Bead of Rapid Flashing Sealant (9995) in accordance with instructions, to properly seal between Rapid Flashing Strip and Rapid Flashing, and between Rapid Flashing and wall.


Slate (4261).

20mmmin.

75mmmin.

Trussed rafter.

50 x 25mm S.W. batten. Underlay.

Double Roman tile.

Rapid Flashing 280mm (9955/6) or 370mm (9957) (depending on how tiles are cut/positioned at abutment) cover flashing, flashing to dressed over tiles by not less than 150mm and a complete pan and crown of the profile, properly adhered to tiles and wall with built-in butyl strips. Rapid Flashing to be laid in accordance with Redland Fixing Instructions.

Rapid Flashing Strip (9998) fixed in accordance with instructions with screws suitable for substrate. Screw holes sealed with Rapid Flashing Sealant (9995).

Bead of Rapid Flashing Sealant (9995) in accordance with instructions, to properly sea between Rapid Flashing and Rapid Flashing Strip, and between Rapid Flashing Strip and wall.

Continuous Flashing, Strip - Profile Tiles

Continuous Flashing, Chased - Flat Interlocking Tiles

Trussed rafter.

Redland GRP Secret Gutter.

38 x 38 S.W Nogging.

Underlay.



Gap: Nominal 2mm to 15mm maximum.

Slate (4261).

65mmmin.

Rapid Flashing 280mm (9955/6) (with top edge including butyl strip removed) cover flashing turned 25mm into brickwork (see detail), into a 25mm x 10mm chased raking slot. Flashing to dress over slate by not less than 120mm, and be properly adhered to slate with built-in butyl strip. Rapid Flashing to be laid in accordance with Redland Fixing Instructions.

Trussed rafter.

50 x 25mm S.W. batten.Underlay.

Double Roman tile.

Rapid Flashing 280mm (9955/6) or 370mm (9957) (depending on how tiles are cut/positioned at abutment) (with top edge including butyl strip removed) cover flashing 25mm into brickwork (see detail), into a 25mm x 10mm chased raking slot. Flashing to dress over tiles by not less than 150mm and a complete pan and crown of the profile, and be properly adhered to tiles with built-in butyl strip. Rapid Flashing to be laid in accordance with Redland Fixing Instructions. 65mm

min.

20mmmin.

Continuous Flashing, Chased - Profile Tiles

Side Abutments

10 11

Traditional Step Flashing - Profile Tiles

Continuous Flashing, Chased - Profile Tiles

Continuous Flashing, Strip - Profile Tiles

Traditional Step Flashing - Flat Interlocking Tiles

Rapid Flashing 140mm (9953) to lap over secret gutter upstand by at least 55mm and extend at least a further 30mm up wall (both measured perpendicular to roof slope), and be properly adhered with built-in butyl strip. Rapid Flashing to be laid in accordance with Redland Fixing Instructions.

Gap: Nominal 2mm to 15mm

maximum.

Double Roman Tile (2201) with nibs removed as required to avoid clash with gutter. Must be mechanically fixed.

Eaves comb, with bead of Rapid Flashing Sealant under full length along centre of base, nailed to gutter edge batten through sealant, with S.S or galvanized nails.

Trussed rafter.

Underlay75 x 50mm S.W. nogging.

25 x 25mm S.W. gutter edge batten.

55mmmin.Lap

75mmmin.Lap

Underlay

Gap: Nominal 2mm to

15mm max.


Mini Stonewold Slates with nibs removed as required to avoid clash with gutter. Must be mechanically fixed: - - Half Slate Pair (4263).- Slate (4261).

Rapid Flashing 140mm (9953) (with top edge including butyl strip removed) cover flashing turned 25mm into brickwork (see detail), into a 25mm x 10mm chased raking slot. Flashing to lap over secret gutter upstand by at least 55mm, and be properly adhered with built-in butyl strip. Rapid Flashing to be laid in accordance with Redland Fixing Instructions.

Rapid Flashing 370mm (9957) dressed up wall to at least 75mm above slate-line (measured perpendicular to roof slope) and properly adhered to wall with built in butyl strip, to form secret gutter with welt over gutter edge batten (remove bottom edge including butyl strip, if necessary). Minimum clear internal dimensions = 75mm x 25mm.

75 x 50mm S.W. noggingTrussed rafter.


75mmmin.

Upstand

55mmmin.Lap

85m

m s

tep

flash

ing


Gap: Nominal 2mm to 15mm max.



Trussed rafter.

Underlay.

Cavity tray.

75 x 50mm S.W. nogging


55mmmin.Lap

75mmmin.Lap

Continuous Flashing, Chased - Flat Interlocking Tiles

Underlay.

Gap: Nominal 2mm to

15mm max.


Mini Stonewold Slates with nibs removed as required to avoid clash with gutter. Must be mechanically fixed: - - Half Slate Pair (4263), - Slate (4261).

Rapid Flashing 140mm (9953) to lap over secret gutter upstand by at least 55mm and extend at least a further 30mm up wall (both measured perpendicular to roof slope), and be properly adhered with built-in butyl strip. Rapid Flashing to be laid in accordance with Redland Fixing Instructions.

Bead of Rapid Flashing Sealant (9995) in accordance with instructions, to properly seal between Rapid Flashing Strip and Rapid Flashing, and between Rapid Flashing and wall. Rapid Flashing Strip (9998) fixed in accordance with instructions with screws suitable for substrate. Screw holes sealed with Rapid Flashing Sealant (9995).

75 x 50mm S.W. nogging.Trussed

rafter.


75mmmin.

Upstand

30mmmin.

55mmmin.Lap

Rapid Flashing 280mm (9955/6) (cut down centre to form two 140mm strips, each with butyl on one side) step flashing to lap soakers upstand by 55mm. Allow 85mm to cut step flashing angles flashing turned 25mm into brickwork (see detail), into a 25mm x 10mm chased raking slot. Flashing to lap over secret gutter upstand by at least 55mm, and be properly adhered with built-in butyl strip. Rapid Flashing to be laid in accordance with Redland Fixing Instructions.

Gap: Nominal 2mm to 15mm max.



Trussed rafter.

Underlay.75 x 50mm S.W. nogging.


55mmmin.Lap

75mmmin.Lap

Continuous Flashing, Strip - Flat Interlocking Tiles

Sidewall / Step Flashing Side Abutments – Open Gutters

Gap: Nominal 2mm to

15mm max. Underlay

Rapid Flashing 370mm (9957) dressed up wall to at least 75mm above slate-line (measured perpendicular to roof slope) and properly adhered to wall with built in butyl strip, to form secret gutter with welt over gutter edge batten (remove bottom edge including butyl strip, if necessary). Minimum clear internal dimensions = 75mm x 25mm.

75 x 50mm S.W. noggingTrussed

rafter.


75mmmin.

Upstand

55mmmin.Lap

85mmstepflashing


Cavity tray.

Mini Stonewold Slates with nibs removed as required to avoid clash with gutter. Must be mechanically fixed: - Half Slate Pair (4263).- Slate (4261).


1312

65mmmin.

38mm x 25mm S.W. batten, 40mm down slope from wall.

Plain tile.

Plain eaves/top tile.

Underlay dressed at least 60mm up wall.

Cavity tray extends to 150mm beyond abutment verges.

Rapid Flashing 280mm (9955/6) or 370mm (9957) (depending upon brick coursing) cover flashing, with top edge including butyl strip removed, dressed closely over slate and up wall, and turned 25mm into wall under cavity tray (where required or specified). Tile lap at least 90mm. Bottom edge adhered with butyl strip. All Rapid Flashing to be laid, fitted and fixed in accordance with the Redland Rapid Flashing Instructions. Add WBP ply support for Rapid Flashing between slate and wall, if required or specified.

Weepholes.

Non-Ventilated, Chased - Plain Tiles

Sidewall / Step Flashing Top Edge Abutments

Rapid Flashing should cover the tiles or slates by a minimum 90mm and turned up the wall for a minimum of 65mm if chased or 75mm if finished with Strip.

Non-VentilatedFold Rapid Flashing according to the measurements above and remove one part of the backing film. Form this part to the tiles and ensure the edge with the butyl-strip is properly fixed to the tiles. Then remove the rest of the backing film and form Rapid Flashing to the wall. Fix according to the chapter on joints.

VentilatedFix the PVC-Ventilation profile and tray, then fit Rapid Flashing into the joint of the ventilation profile without removing the backing film. After this remove the backing film keeping the Rapid Flashing in position. For fixing into the brickwork see the chapter on joints.

For exposed areas please contact Redland Technical Solutions

Top edge abutments at walls, whether ventilated or not, can be finished neatly using Rapid Flashing either chased into the wall or completed using Rapid Flashing Strip.

Non-Ventilated Top Edge Abutment

Ventilated Top Edge Abutment

75mmmin.

Underlay dressed 60mm up wall.

Double Roman tile.

Rapid Flashing 280mm (9955/6) cover flashing, dressed closely over slates and up wall. Tile lap at least 90mm. Bottom and top edges adhered to slates and wall with built-in butyl strip. All Rapid Flashing to be laid, fitted and fixed in accordance with the Redland Rapid Flashing Instructions. Add WBP ply support for Rapid Flashing between slate and wall, if required or specified.

Rapid Flashing Strip (9998) fixed in accordance with instructions, with screws suitable for substrate. Screw holes sealed with Rapid Flashing Sealant (9995).

Bead of Rapid Flashing Sealant (9995) in accordance with instructions, to properly seal between Rapid Flashing Strip and Rapid Flashing, and between Rapid Flashing and wall.


Non-Ventilated, Strip - Profile Tiles Ventilated, Chased - Profile Tiles

65mmmin.

Underlay finished 30mm down slope from wall.

Double Roman tile.


Weepholes.


uPVC Profile Filler Unit.

Rapid Flashing support tray.

Ratchet clip with spacer block.

Use Abutment Ventilation Pack (9543).

Rapid Flashing 370mm (9957) cover flashing, with top edge including butyl strip removed, dressed closely over support tray and up wall, and turned 25mm into wall under cavity tray (where required or specified). Bottom edge engaged in slot in support tray, and adhered with butyl strip. All Rapid Flashing to be laid, fitted and fixed in accordance with the Redland Rapid Flashing Instructions.

Ventilated, Chased - Flat Interlocking Tiles

65mmmin.

Underlay finished 30mm down slope from wall.

Mini Stonewold Slate.


Weepholes.

Use Abutment Ventilation Pack (9548).


uPVC Profile Filler Unit.

Rapid Flashing support tray.

Ratchet clip with spacer block.

Rapid Flashing 370mm (9957) cover flashing, with top edge including butyl strip removed, dressed closely over support tray and up wall, and turned 25mm into wall under cavity tray (where required or specified). Bottom edge engaged in slot in support tray, and adhered with butyl strip. All Rapid Flashing to be laid, fitted and fixed in accordance with the Redland Rapid Flashing Instructions.

1514

Back Gutter, Chased - Flat Interlocking or Profile Tiles

100mmmin.

150mm

50mm

75mmmin.

19mm thick timber or WBP ply gutter bottom and side properly fixed to rafters, noggings and batten, with S.S or galvanised nails. 3mm to 5mm nominal clear gap from wall.

6mm WBP ply tilting board properly fixed to rafters and gutter side with S/S or galvanised nails.

Mini Stonewold slate.

50mm x 25mm S.W. tile batten.

38mm x 38mm S.W. noggings properly fixed between rafters.

Underlay dressed over tilting board and tilting fillet, protruding by 25mm.

Cavity tray (where required or specified) extends to 150mm beyond abutment verges.

38mm x 38mm S.W. batten. properly fixed to wall, or to rafters via S.W. struts.

Nom. gap 3mm to

5mm

S.W. tilting fillet cut to size to ensure correct tile alignment, and properly fixed to gutter side with S/S or galvanised nails.

Rapid Flashing is an ideal choice for completing all the details around a chimney including the back gutter.

For other areas of chimney flashing please refer to Top Edge Abutments and Side Abutment details in this application guide.

Chimneys – Back Gutter

100mmmin.

Nom. gap 3mm to

5mm






Plain Tiles - Tile (6151), on 38mm x 25mm batten Eaves/Ridge Tile (6154), on 25mm x 25mm batten.


75mmmin.

Back Gutter, Strip - Plain Tiles


50mm x 25mm S.W. tile batten.

Double Roman Tile




Nom. gap 3mm to

5mm


100mmmin.


75mmmin.

Back Gutter, Strip - Flat Interlocking or Profile Tiles

560mm wide Rapid Flashing can be used to weather the back gutter of a chimney. Ensure a minimum upstand of 100mm is maintained across the back and all sections of Rapid Flashing overlap by a minimum of 30mm.

A soft wood tilting fillet must be in place to form the back gutter and support the Rapid Flashing.

Fold the Rapid Flashing back gutter around and down the tiles and form into the brick joints or fix using Rapid Flashing Strip. You may need to add another piece of Rapid Flashing to extend it up onto the lay board and tilt fillet.

Use the roller to mould into place. Once the back gutter is in place, turn the side edge over on itself to create a 20mm welt at the top edge and sides covered by tiles.

Use Rapid Flashing Sealant to seal all joints. Note: If at any time the Rapid Flashing is not wide enough, it can be increased in width by fusing two widths together. When joining two pieces of Rapid Flashing together, overlap by a minimum of 30mm and press firmly using a roller to ensure seams are fused together.

16 17

Wall connection

Ridge saddle

Outlets with a removable or no cap

The Rapid Flashing slate should be laid on the roof so that the butyl-strips point to the eave. The size required for the base of the slate will vary according to the type of roof covering and diameter of the pipe. For standard plain tiles and slates with a 100mm diameter pipe, a width of 370mm should be used. The base should extend min. 150mm in front of the pipe over the tiles. The back should finish a min 100mm under the tile or slate. End under the tiles with a 20mm welt. Cut a hole in the base for the pipe with a diameter 20mm smaller than the diameter of the pipe and pull the flashing over the pipe. The stretchability of Rapid Flashing will help to put the pipe through. Seal the resulting collar a min. 60mm strip of Rapid Flashing by wrapping it around the pipe. For profiled tiles the Rapid Flashing base has to end ín the valley of the next tile. Outlets with a fixed cap The Rapid Flashing slate should be laid on the roof so that the butyl-strips point to the eave. This application requires a slate made of two pieces of Rapid Flashing. For the width and the complete length use the same assumptions as above. The two parts have to overlap by a min 30mm.

Rapid Flashing is the perfect choice for completing the details around common roof penetrations such as soil vent stacks, metal flues and other roof outlets.

Removable cap

Fixed cap

Roof Outlets

IMPORTANT: No gas flue pipes or pipes with a temperature higher than 100°C

Rapid Flashing allows weather proofing of the junction between ridge and valleys, other abutments and roof details.

Ridge Saddles

Ridge saddles

This can easily be done by using two pieces of Rapid Flashing; one covering the ridge and the second sealing onto the roof area. Start with the piece for the ridge. Cut it to get a V-shape and put it on the ridge. Form a 20mm welt on the ridge-side of the piece. To seal to the roof area use a piece of 370mm width Rapid Flashing with butyl-strips in horizontal direction. Fold it from the tiles along the ridge and cut it in the middle of the ridge until 20mm before the ridge joins the roof area. Form the roof piece over the ridge piece to ensure a 30mm overlap in all areas. Remove the backing film from the each piece and fix in place. Use the self-welding effect of Rapid-Flashing to seal the two parts together using a roller. The minimum headlap over the tile should be 90mm. Wall connection at a ridge

For a sidewall abutment that goes over a ridge use two pieces of Rapid Flashing. The first one will be laid over the ridge by standing up the wall 25mm. The butyl-strips of this piece have to be in parallel with the wall. The second piece is for the connection to the brickwork. Hold the piece to the brickworkand ensure that it covers the width of the first piece and overlaps the upstanding min 30mm after cutting the step-flashing. The two pieces will self-fuse. Finish the abutment by cutting the step-flashing and fixing Rapid Flashing in the joints of the brickwork. The minimum upstand against the wall should be 65mm if chased or 75mm if finished with Strip. The minimum headlap over the tiles should be 90mm.

18 19

Rapid Flashing allows traditional lead roof details between the junction of two roofs to be completed easily leaving an aesthetic join between adjacent roofs.

Lead Rolls

Lead Rolls (Bonding Two Roofs)

Rapid Flashing can be used as flashing for lead rolls. This has to be used if two connecting roofs of a roof have different tiles. A typical way to do this is to use a 50 x 50mm softwood batten which is screw fixed to the tiling battens. The softwood batten is covered by a packing batten topped with a Wood roll. For sealing the lead rolls use two strips of Rapid Flashing with the butyl-strips parallel to it. Choose the width of Rapid Flashing to cover the whole wood roll and a min 150mm of the tile, ensuring a 30mm overlap. To lay the Rapid Flashing start on the wood roll and fix it with clout nails. Form it completely along the shape of the lead roll and fix on the tile side using the butyl-strips. Use a roller to ensure water tight join to the tiles The second part starts from the roof side which is now covered with Rapid Flashing. Fix it around the lead roll to end on the other side. Ensure that the second layer of Rapid Flashing is laid tight and without crinkles on the first layer. An additional fixing with nails is not necessary due to the self-welding effect of Rapid Flashing.

Flat to Profile

Traditional open pitched valley gutters can be constructed using Rapid Flashing using longer lengths and smaller overlaps than lead.

Open Valleys

125mm clear gutter width.

Rapid Flashing 560mm wide in lengths not exceeding 2.5mm, with 150mm head laps.

Rapid Flashing welt turned up and stuck to underside of slates, with built-in butyl strip.

Underlay cut to rake and turned up and over valley support batten.

50 x 25 S.W valley support batten supported on timber valley board and rafters.

Trussed rafters.

Eaves comb fixed with felt tacks.

Mini Stonewold slate.

Bead of Redland Underlay Connection Glue (9464) between underlay and Rapid Flashing, Rapid Flashing fixed with felt tacks through Rapid Flashing and centre of glue bead, to ensure seal.

wIDTh Of VAllEy GUTTERS (mm)

‘A’

Roof Pitch (degrees)

‘A’Design Rainfall Rate per m², Plan Area Draining

0.0625 l/s per m² 0.041 l/s per m² 0.02 l/s per m²

25m² or less

Over 25m²

25m² or less

Over 25m²

25m² or less

Over 25m²

15.0 + 150 – 125 200 125 150

17.5 + 125 200 125 150 100 125

22.5 + 100 150 100 125 100 100

30.0 + 100 125 100 100 100 100

35.0 + 100 100 100 100 100 100

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Customer Service HotlineTelephone 08705 601000facsimile 08705 642742E-mail [email protected]

Technical Solutions HotlineTelephone 08708 702595 facsimile 08708 702596 E-mail [email protected]

we are committed to continuously enhancing and improving our product range. we reserve the right to change our product specificationswe reserve the right to correct any typographical or clerical error or omission. for the latest information contact the Customer Service hotline.

head Office: monier Redland ltd, Sussex manor Business Park, Gatwick Road, Crawley, west Sussex, Rh10 9nZ Designed by TGV, www.tgvdesign.co.uk

www.redland.co.uk

rapid flashing application guide · 14 roof outlets 16 ridge saddles 18 lead rolls 20 open valleys...

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