timber floor

TIMBER FLOORINGAsst. Prof Amruta Khairnar

VPSOA

Types of fl oors

Timber floor Composite floor

1. 2.

Timber fl ooring

• Basement or Ground floor of timber.

• Single Joist timber beam.

• Double Joist timber beam.

• Framed triple joist timber floor.

Basement / ground fl oor of t imber

Auditorium – dances and dramas.

G.L.

wall

D.P.C.F.L.

Floor BoardsBridging joists

Sleeper wall

Wall plates

10 to 15 mm Cement course

1.2 to 1.8m

Filling of selected earth

1

Precautions

• Soil below timber floor – covered with PCC 1:2:4 (100 to

150 mm thk).

• DPC – exterior wall + top of the sleeper wall.

• Well seasoned timber is used.

• Hollow space between bottom of concrete and floor level is

filled up with selected earth.

2Single joist timber fl oorsSpan (

belo

w 3

m)

c

a b

Joist

PLAN

Strutting

Detail at c’

Wall

Wall plate Ceiling

Floor boards

Joist

Air space

Section on ab

300 – 400 mm

Floor boards

Herring bone strutting

Wedges Joist

Double joist timber fl oors 3

Bridging joist @ 300 mm c/c

1.8m to 2.4m

Binders

PLAN

300mm

3.6

to 7

.5m

Methods of fi xing binders with joists

Binders Cogged Joint

Fillet

Floor boards

Notched joint

Bridging Joist Bridging Joist

Disadvantages

The weight of the floor is

thrown on the few points

on the wall.

Depth of the floor is increased by

use of binders and accordingly,

the height of the room is

decreased.

Bridging Joist

Binders

Framed or t r ip le jo ist t imber fl oors 4

Binders

Girders

PLAN

More

than 7

.5m

Bridging joist

3m

Girders

Deta i ls o f f ramed t imber fl oors

Binder Binder

Floor boards

Furring piece Bridging joists

Ceiling Tusk and tenon joint

Ceiling joist

Single joist Double joist Triple joist (framed)

Brid

gin

g

joist

1.8

m to

2.4

m

Bin

ders

3.6 to 7.5mB

inder

Gird

er

More than 7.5m

Brid

gin

g

joist

Jois

t

Str

utt

ing

Below 3 m

Floor boards :

• @ top of the bridging joist• Width : 100 – 200mm• Thk : 20 – 40mm• When subjected to heavy

traffic - thk: 60- 80mm

Pugging:

• In order to make timber floor sound proof.

• Pugging plaster – mixture of chopped straw & mortar.

• Insulated boards are supported on fillets.

Floor ceiling :

• Underside of the floor, improve appearance.

• Plaster boards, asbestos cement sheets.• Rest on the bridging joists / binders.

Bridging joists

Fillets Insulating boards

Source : BORDERS UNDERFLOOR HEATING