stabilising rubble-filled and random stone walls - … masonry repair details ©april 2017...

HELIFIXMASONRY REPAIR DETAILS © April 2017

Stabilising Rubble-Filledand Random Stone Walls

� RF01 – Delaminated or Separating Masonry in a Rubble Filled orSolid Wall using CemTies

� RF02 – Brick-Faced Random Stone Walls using CemTiesthrough the Brick Faces

� RF03 – Brick Faced Random Stone Walls using CemTiesthrough the Mortar Joints

� RF04 – Stone-Faced Random Stone Walls using CemTiesthrough the Stone Faces

� RF05 – Stone-Faced Random Stone Walls using CemTiesthrough the Mortar Joints

� RF06 – Brick Quoins on Random Stone walls using CemTies

� RF07 – Brick Quoins on Random Stone walls using CemTiesand HeliBars

� RF08 – Stone Quoins on Random Stone Walls using CemTies

� RF09 – Stone Quoins on Random Stone walls using CemTiesand HeliBars

� RF10 – Repair of Delaminated or Separating Masonry in a Rubble-Filled Wall using HeliBars

� RF11 – Reconnecting a Cracked Corner in a Rubble-FilledWall using HeliBars

� RF12 – Reconnecting Separated Internal and External Rubble-FilledWalls using HeliBars

Tel: 020 8735 5200 Fax: 020 8735 5201email: [email protected]

www.helifix.co.uk

HELIFIXMASONRY REPAIR DETAILS © January 2013

Repair of Delaminated or Separating Masonry in a Rubble-Filled or Solid Wall using CemTies

RF01

1. Mark the positions for the holes on the outer face of thewall.

2. Drill a 14mm clearance hole (16mm if the CemTie islonger than 450mm) at the required locations and tothe specified depth.

3. Clean out ALL dust from the holes and thoroughly flushwith water. Where the substrate is very porous orflushing with water is inappropriate, use HeliPrimerWB. Ensure the holes are damp or primed prior tocommencing step 7.

4. Attach the required length of CemTie pinning nozzle tothe gun.

5. Mix HeliBond cementitious grout using a power mixerand load into the Helifix Pointing Gun HD.

6. Pump grout to fill the nozzle.7. Wind the CemTie into the nozzle and ensure that it is

fully covered in grout.8. Insert the nozzle to the full depth of the drilled hole and

pump the grout.9. Make good all holes at the surface with matching

mortar or leave ready for any decoration.10. Clean tools with clean, fresh water.

N.B. If diamond core drilling is used, the internal surface of thehole must be roughened to ensure a good bond.

For drilling.................SDS rotary hammer drill 650/700w or diamond core drill

For mixing HeliBond ................................3-jaw-chuck drill with mixing paddle

For insertion of the CemTies .......................................Helifix Pointing Gun HD with pinning nozzle

If your application differs from this repair detail or you require specific adviceon your particular project, call the Helifix Technical Sales Team on 020 87355222. Our Technical Department can provide you with a full support serviceincluding:

� Advice, assistance and recommendations on all structural repair matters

� Devising and preparing complete repair proposals for specific situations

� An insurance-backed warranty via our Approved Installers scheme

METHOD STATEMENT

RECOMMENDED TOOLING

GENERAL NOTES

Specification NotesThe following criteria are to be used unless specified otherwise:

A. CemTies are typically to be installed at a density of 5 ties/m2 (i.e. 450mmhorizontal and 450mm vertical spacing with alternate rows staggered).

B. The density is increased around openings with ties placed at 300mmvertical spacing and 225mm back from the opening.

C. Depth of hole to be CemTie length +25mm. CemTies should be embeddedto a minimum depth of 75mm into the far leaf.

D. In hot conditions ensure the masonry is well wetted or primed to preventpremature drying of the HeliBond due to rapid de-watering. Ideallyadditional wetting of the hole should be carried out just prior to insertingthe CemTie.

E. Do not use HeliBond when the air temperature is +4°C and falling or applyover ice. In all instances the hole must be thoroughly damp or primed withHeliPrimer WB prior to injection of the HeliBond grout.

The above specification notes are for general guidance only and Helifix reservesthe right to amend details/notes as necessary.


Repair of Brick-Faced Random StoneWalls using CemTies through Brick Faces

RF02

1. Mark the positions for the holes on the outer face ofthe wall.

2. Drill a 14mm clearance hole (16mm if the CemTie islonger than 450mm), at the required locations,through the brick face of the wall and into thebackup material to the specified depth.

3. Clean out ALL dust from the holes and thoroughlyflush with water. Where the substrate is very porousor flushing with water is inappropriate, useHeliPrimer WB. Ensure the hole is damp or primedprior to commencing step 7.

4. Attach the required length of CemTie pinning nozzleto the gun.

5. Mix HeliBond cementitious grout using a powermixer and load into the Helifix Pointing Gun HD.

6. Pump grout to fill the nozzle.7. Wind the CemTie into the nozzle and ensure that it

is fully covered in grout.8. Insert the nozzle to the full depth of the drilled hole

and pump the grout until the CemTie is fullyembedded.

9. Make good all holes at the surface with matchingmortar. The crack within the wall should be weather-proofed using an appropriate Helifix bonding agente.g. HeliBond or CrackBond, depending on thewidth of the crack and the surface made good or leftready for any decoration.

10. Clean tools with clean, fresh water.




For insertion of the CemTies ..................................Helifix Pointing Gun Kit HDwith pinning nozzle

If your application differs from this repair detail or you require specificadvice on your particular project, call the Helifix Technical Sales Team on020 8735 5222. Our Technical Department can provide you with a fullsupport service including:




METHOD STATEMENT

RECOMMENDED TOOLING

GENERAL NOTES


A. The density of the ties will depend upon the condition of the masonry andthe loading it is expected to withstand. In general, the density should not beless than 2.5 ties/m2 (900mm x 450mm).

B. The depth of fixing into the backup material must be a minimum of 50mmto provide a secure connection (prior testing may be required).

C. Depth of hole to be CemTie length +25mm.

D. In hot conditions ensure the masonry is well wetted or primed to preventpremature curing of the HeliBond due to rapid de-watering. Ideallyadditional wetting of the hole, or priming with HeliPrimer WB, should becarried out just prior to inserting the CemTie.




Hidden Repair of Brick-FacedRandom Stone Walls using CemTiesthrough Mortar Joints

RF03

1. Mark the positions for the holes at the top end of theperp-ends on the outer face of the wall.

2. Drill a 14mm diameter hole (16mm if the CemTie islonger than 450mm), angled upwards wherepossible, to pass through the brick above and intothe backup material to the specified depth.

3. Clean out ALL dust from the hole and thoroughlyflush with water. Where the substrate is very porousor flushing with water is inappropriate, useHeliPrimer WB. Ensure the hole is damp or primedprior to commencing step 7.






9. Make good all holes at the surface with matchingmortar and brick dust.










METHOD STATEMENT

RECOMMENDED TOOLING

GENERAL NOTES


A. CemTies are to be installed at an angle of 30° to 40° to allow sufficientfixing in the brick facing.

B. The density of the ties will depend upon the condition of the masonry andthe loading it is expected to withstand. In general, the density should not beless than 2.5 ties/m2 (900mm x 450mm).

C. The depth of fixing into the backup material must be a minimum of 50mmto provide a secure connection (prior testing may be required).

D. Depth of hole to be CemTie length +25mm.

E. In hot conditions ensure the masonry is well wetted or primed to preventpremature curing of the HeliBond due to rapid de-watering. Ideallyadditional wetting of the hole, or priming with HeliPrimer WB, should becarried out just prior to inserting the CemTie.

F. Do not use HeliBond when the air temperature is +4°C and falling or applyover ice. In all instances the hole must be thoroughly damp or primed withHeliPrimer WB prior to injection of the HeliBond grout.



Repair of Stone-Faced Random StoneWalls using CemTies through Stone Faces

RF04


2. Drill a 14mm clearance hole (16mm if the CemTie islonger than 450mm), at the required location,through the stone facing of the wall and into thebackup material to the specified depth.







9. Make good all holes at the surface with matchingmortar and stone dust.










METHOD STATEMENT

RECOMMENDED TOOLING

GENERAL NOTES


A. The density of the ties will depend upon the condition of the masonry andthe loading it is expected to withstand. In general, the density should not beless than 2.5 ties/m2 (900mm x 450mm).

B. The depth of fixing into the backup material must be a minimum of 50mmto provide a secure connection (prior testing may be required).


D. In hot conditions ensure the masonry is well wetted or primed to preventpremature curing of the HeliBond due to rapid de-watering. Ideallyadditional wetting of the hole, or priming with HeliPrimer WB, should becarried out just prior to inserting the CemTie.




Hidden Repair of Stone-Faced Random Stone Walls using CemTiesthrough Mortar Joints

RF05


2. Drill a 14mm diameter hole (16mm if the CemTie islonger than 450mm), angled upwards wherepossible, to pass through the brick above and intothe backup material to the specified depth.







9. Make good all holes at the surface with matchingmortar and stone dust. The crack within the wallshould be weather-proofed using an appropriateHelifix bonding agent e.g. HeliBond or CrackBond,depending on the width of the crack and the surfacemade good or left ready for any decoration.










METHOD STATEMENT

RECOMMENDED TOOLING

GENERAL NOTES


A. CemTies are to be installed at an angle of 30° to 40° to allow sufficientfixing in the stone facing.

B. The density of the ties will depend upon the condition of the masonry andthe loading it is expected to withstand. In general, the density should not beless than 2.5 ties/m2 (900mm x 450mm).

C. The depth of fixing into the backup material must be a minimum of 50mmto provide a secure connection (prior testing may be required).

D. Depth of hole to be CemTie length +25mm.





Repair of Brick Quoins on Random Stone Walls using CemTies

RF06


2. Drill a 16mm clearance hole at the required locationthrough the brick quoin and into the backup materialto the required depth.







9. Make good all holes at the surface with matchingmortar and brick dust.










METHOD STATEMENT

RECOMMENDED TOOLING

GENERAL NOTES


A. CemTies are to be installed at a vertical spacing of 450mm.

B. CemTies are to extend at least 500mm past the join between the quoin andthe wall.


D. CemTies are to be installed within the centre third of the wall.





Repair of Brick Quoins on Random Stone Walls using CemTies and HeliBars

RF07

1. Using a twin-bladed, diamond-tipped wall chaserwith vacuum attachment followed by a hand orpower chisel, cut slots into the horizontal mortarjoints, to the specified depth and at the requiredvertical spacing. Ensure that NO mortar is leftattached to the exposed brick and stone surfaces inorder to provide a good masonry/grout bond. Thisoperation may require the use of hand tools toremove the mortar due to the random nature of thestone.


3. Drill a 16mm clearance hole at the required locationthrough the brick quoin and into the backup materialto the required depth.

4. Clean out ALL dust from the holes and slots andthoroughly flush with water. Where the substrate isvery porous or flushing with water is inappropriate,use HeliPrimer WB. Ensure the holes and slotsare damp or primed prior to commencing steps 9and 11.



7. Pump grout to fill the nozzle. 8. Wind the CemTie into the nozzle and ensure that it



10. Remove pinning nozzle and fit mortar nozzle.11. Inject a bead of HeliBond grout, approx. 15mm

deep, into the back of the slot.12. Push the 6mm HeliBar into the grout to obtain good

coverage.13. Insert a second bead of HeliBond grout over the

exposed HeliBar and iron it into the slot using afinger trowel. Inject additional HeliBond asnecessary, leaving 10-15mm for new pointing.

14. Make good the CemTie holes and point up the slotswith a suitable matching mortar and weather-proofany cracks with an approved Helifix bonding agente.g. HeliBond or CrackBond depending on the widthof the crack. Make good the surface or leave readyfor any decoration.



Pointing may be carried out as soon as is convenient after theHeliBond has started to gel.

For cutting slots up to 40mm deep .......................................Twin bladed cutter with vacuum attachment

To achieve final depth of slot beyond 40mm ....................Hand or power chisel

For drilling and power chisel .......................SDS rotary hammer drill 650/700wor diamond core drill


For injection of HeliBond into slots .......................Helifix Pointing Gun Kit HDwith mortar nozzle


For smoothing pointing ...................................................Standard finger trowel





METHOD STATEMENT

RECOMMENDED TOOLING

GENERAL NOTES


A. CemTies and HeliBar to be installed at a vertical spacing of 450mm.

B. CemTies and HeliBar to extend at least 500mm past the joint between thequoin and wall.



E. Depth of slot into the masonry to be 35 to 40mm.

F. Height of slot to be equal to full mortar joint height, with a minimum of8mm. For thin mortar joint specifications refer to the Helifix TechnicalDept.

G. In hot conditions ensure the masonry is well wetted or primed to preventpremature curing of the HeliBond due to rapid de-watering. Ideallyadditional wetting of the holes and slots should be carried out just prior toinserting the CemTies and HeliBar.

H. Do not use HeliBond when the air temperature is +4°C and falling or applyover ice. In all instances the holes and slots must be thoroughly damp orprimed with HeliPrimer WB prior to injection of the HeliBond grout.



Repair of Stone Quoins on Random Stone Walls using CemTies

RF08


2. Drill a 16mm clearance hole at the required locationthrough the stone quoin and into the backupmaterial to the required depth.



5. Mix HeliBond cementitious grout and load into theHelifix Pointing Gun HD.


is fully covered in grout. 8. Insert the nozzle to the full depth of the drilled hole












METHOD STATEMENT

RECOMMENDED TOOLING

GENERAL NOTES


A. CemTies are to be installed at a vertical spacing of 450mm.

B. CemTies are to extend at least 500mm past the join between the quoin andthe wall.



E. In hot conditions ensure the masonry is well wetted or primed to preventpremature curing of the HeliBond due to rapid de-watering. Ideallyadditional wetting of the hole should be carried out just prior to insertingthe CemTie.




Repair of Stone Quoins on Random Stone Walls using CemTies and HeliBars

RF09

1. Using a twin-bladed, diamond-tipped wall chaserwith vacuum attachment followed by a hand orpower chisel, cut slots into the horizontal mortarjoints, to the specified depth and at the requiredvertical spacing. Ensure that NO mortar is leftattached to the exposed brick and stone surfaces inorder to provide a good masonry/grout bond. Thisoperation may require the use of hand tools toremove the mortar due to the random nature of thestone.


3. Drill a 16mm clearance hole at the required locationthrough the brick stone and into the backup materialto the required depth.

4. Clean out ALL dust from the holes and slots andthoroughly flush with water. Where the substrate isvery porous or flushing with water is inappropriate,use HeliPrimer WB. Ensure the holes and slotsare damp or primed prior to commencing steps 9and 11.



7. Pump grout to fill the nozzle. 8. Wind the CemTie into the nozzle and ensure that it



10. Remove pinning nozzle and fit mortar nozzle.11. Inject a bead of HeliBond grout, approx. 15mm

deep, into the back of the slot using the mortarnozzle.

12. Push the 6mm HeliBar into the grout to obtain goodcoverage.

13. Insert a second bead of HeliBond grout over theexposed HeliBar and iron it into the slot using afinger trowel. Inject additional HeliBond asnecessary, leaving 10-15mm for new pointing.




Pointing may be carried out as soon as is convenient after theHeliBond has started to gel.

For cutting slots up to 40mm deep .......................................Twin bladed cutter with vacuum attachment

To achieve final depth of slot beyond 40mm ....................Hand or power chisel

For drilling and power chisel .......................SDS rotary hammer drill 650/700wor diamond core drill


For injection of HeliBond into slots .......................Helifix Pointing Gun Kit HDwith mortar nozzle







METHOD STATEMENT

RECOMMENDED TOOLING

GENERAL NOTES


A. CemTies and HeliBar to be installed at a vertical spacing of 450mm.

B. CemTies and HeliBar to extend at least 500mm past the join between thequoin and wall.



E. Depth of slot into the masonry to be 35 to 40mm.

F. Height of slot to be equal to full mortar joint height, with a minimum of8mm. For thin mortar joint specifications refer to the Helifix TechnicalDept.

G. In hot conditions ensure the masonry is well wetted or primed to preventpremature curing of the HeliBond due to rapid de-watering. Ideallyadditional wetting of the holes and slots should be carried out just prior toinserting the CemTies and HeliBar.

H. Do not use HeliBond when the air temperature is +4°C and falling or applyover ice. In all instances the holes and slots must be thoroughly damp orprimed with HeliPrimer WB prior to injection of the HeliBond grout.



Repair of Delaminated or SeparatingMasonry in a Rubble-Filled Wallusing HeliBars

RF10


2. Drill 12mm clearance holes through the wall in astaggered pattern.

3. Using a twin-bladed, diamond-tipped wall chaserand vacuum attachment, cut 350mm long slots intothe horizontal mortar joints to one side of the holes,to the specified depth and at the required verticalspacing. Ensure that NOmortar is left attached to theexposed stone surfaces in order to provide a goodmasonry/grout bond. This operation may require theuse of hand tools to remove the mortar due to therandom nature of the stone.

4. Repeat step 3 on the other side of the wall ensuringthe slots are opposite those already cut.

5. Clean out ALL mortar from the slots and dust fromthe slots and holes and thoroughly flush with water.Where the substrate is very porous or flushing withwater is inappropriate, use HeliPrimer WB. Ensurethe holes are damp or primed prior to commencingstep 9.

6. Mix HeliBond cementitious grout using a powermixer and load into the Helifix Pointing Gun CS.

7. Fit an appropriate mortar nozzle.8. Insert the HeliBar through the hole, making sure that

it is long enough for a minimum of 300mm to bebent at right angles and bedded into the slots onboth the inner and outer faces of the wall.

9. Inject a large bead of HeliBond grout, approx.15mm deep, into the back of the slot on the outerface and tool firmly into the slot.

10. Bend the HeliBar to the required angle and pushfirmly into the grout to obtain good coverage.

11. Inject a second smaller bead of HeliBond grout overthe exposed HeliBar and iron it into the slot using afinger trowel. Inject additional HeliBond grout asnecessary, leaving 10-15mm for new pointing.

12. Point up the remaining slot with a suitable matchingmortar and make good the crack using anappropriate Helifix bonding agent depending on thewidth of the crack.

13. Repeat steps 9 to 12 on the inner wall.14. Clean tools with clean, fresh water.

N.B. Pointing may be carried out as soon as is convenient afterthe HeliBond has started to gel.

For cutting slots up to 40mm deep ...............................Twin-bladed cutter withvacuum attachment

For drilling .................................................SDS rotary hammer drill 650/700w



For smoothing pointing ..................................................Standard finger trowel





RECOMMENDED TOOLING

GENERAL NOTES


A. Depth of slot into the masonry to be 35-40mm + the thickness of any render.

B. Height of slot to be equal to full mortar joint height, with a minimum of8mm. For thin mortar joint specifications refer to the Helifix TechnicalDept.

C. Bars to be installed at 450mm vertical x 450mm horizontal centres in astaggered pattern.

D. In hot conditions ensure the masonry is well wetted or primed to preventpremature drying of the HeliBond due to rapid de-watering. Ideallyadditional wetting of the slot, or priming with HeliPrimer WB, should becarried out just prior to injecting the HeliBond grout.

E. Do not use HeliBond when the air temperature is +4°C and falling or applyover ice. In all instances the slot must be thoroughly damp or primed priorto injection of the HeliBond grout.


METHOD STATEMENT


Reconnecting a Cracked Corner in aRubble-Filled Wall using HeliBars

RF11

1. Using a twin-bladed, diamond-tipped wall chaserand vacuum attachment, cut slots into the horizontalmortar joints on the outer face at positions A & B andon the internal face at positions C & D, to thespecified depth and at the required vertical spacing. NOTE: Internal slots must be vertically staggeredwith external slots.

2. Ensure that NOmortar is left attached to theexposed stone surfaces in order to provide a goodmasonry/grout bond. This operation may require theuse of hand tools to remove the mortar due to therandom nature of the stone.

3. At the end of the slot on the internal wall closest tothe corner, drill a 12mm hole through the wall intothe same height mortar joint on the outer face.

4. Repeat steps 1 & 2 to the mortar joints E & F on theouter face to which the holes have been drilled.

5. Remove ALL dust and mortar from the slots andthoroughly flush with water. Where the substrate isvery porous or flushing with water is inappropriate,use HeliPrimer WB. Ensure the slot is damp orprimed prior to commencing step 8.


7. Fit appropriate mortar nozzle.8. Insert HeliBars into all four slots. Where relevant,

feed the HeliBar through the hole to allow sufficientlength to be bent at 90° and be bedded into slots Eand F.

9. Inject a bead of HeliBond grout, approx. 15mmdeep, into the back of the slot.

10. Bend the HeliBar to the required angle and pushfirmly into the grout to obtain good coverage.

11. Inject a second bead of HeliBond grout over theexposed HeliBar and iron it into the slot using afinger trowel. Inject additional HeliBond grout asnecessary, leaving 10-15mm for new pointing.







For injection of HeliBond into slots ..............................Helifix Pointing Gun CSwith mortar nozzle






METHOD STATEMENT

RECOMMENDED TOOLING

GENERAL NOTES




C. Internal HeliBars to be drilled through adjoining wall, bent and returned inexternal bed joints to a minimum of 1000mm beyond crack or apex ofcorner. External bars to extend a minimum of 1000mm beyond crack orapex of corner.

D. All 3 HeliBars to be installed at every 450mm vertical centre.

E. In hot conditions ensure the masonry is well wetted or primed to preventpremature drying of the HeliBond due to rapid de-watering. Ideallyadditional wetting of the slot, or priming with HeliPrimer WB, should becarried out just prior to injecting the HeliBond grout.

F. Do not use HeliBond when the air temperature is +4°C and falling or applyover ice. In all instances the slot must be thoroughly damp or primed priorto injection of the HeliBond grout.


B1000mm

A1000mm

E

D

FC


Reconnecting Separated Internal andExternal Rubble-Filled Wallsusing HeliBars

RF12

1. Using a twin-bladed, diamond-tipped wall chaserand vacuum attachment, cut staggered slots into thehorizontal mortar joints at positions A & B on theinternal wall, to the specified depth and at therequired vertical spacing. Ensure that NOmortar isleft attached to the exposed stone surfaces in orderto provide a good masonry/grout bond. Thisoperation may require the use of hand tools toremove the mortar due to the random nature of thestone.

2. At the end of the slots closest to the corner drill a12mm hole, across the rubble-filled cavity, into thesame height mortar joint on the external face of thewall.

3. Repeat step 1 at locations C & D on the external faceof the wall, starting from the drilled exit hole.

4. Remove ALL dust and mortar from the slots andthoroughly flush with water. Where the substrate isvery porous or flushing with water is inappropriate,use HeliPrimer WB. Ensure the slot is damp orprimed prior to commencing step 8.


6. Fit appropriate mortar nozzle.7. Insert the HeliBar through the hole, allowing

sufficient length of 500mm to be bent at right anglesand be bedded into the outer face slot.

8. Inject a bead of HeliBond grout, approx. 15mmdeep, into the back of the slot.

9. Use a finger trowel to tool the grout to obtain goodcoverage.

10. Inject a second bead of HeliBond grout over anyexposed HeliBar and iron it into the slot using thefinger trowel. Inject additional HeliBond grout asnecessary, leaving 10-15mm for new pointing.







For injection of HeliBond into slots ..............................Helifix Pointing Gun CSwith mortar nozzle






METHOD STATEMENT

RECOMMENDED TOOLING

GENERAL NOTES




C. Internal HeliBars to be drilled through adjoining wall, bent and returned inexternal bed joints to a minimum of 500mm.

D. Bars to be installed at 450mm vertical centres.

E. In hot conditions ensure the masonry is well wetted or primed to preventpremature drying of the HeliBond due to rapid de-watering. Ideallyadditional wetting of the slot, or priming with HeliPrimer WB, should becarried out just prior to injecting the HeliBond grout.

F. Do not use HeliBond when the air temperature is +4°C and falling or applyover ice. In all instances the slot must be thoroughly damp or primed priorto injection of the HeliBond grout.


C500mm

A500mm

B500mm

D500mm

stabilising rubble-filled and random stone walls - … masonry repair details ©april 2017...

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