2. T ypes of floors
1. 2.
Timber floor Composite floor
3. T imber flooring
• Basement or Ground floor of timber.
• Single Joist timber beam.
• Double Joist timber beam.
• Framed triple joist timber floor.
4. Basement / ground floor of timber 1
Auditorium – dances and dramas.
Filling of selected earth
wall
Bridging joists
Floor Boards
F.L.
D.P.C.
1.2 to 1.8m
G.L. Wall plates
Sleeper wall
10 to 15 mm Cement course
5. 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.
6. S i n g l e j o i s t t i m b e r f l o o rs 2
c Joist
Span (below 3m)
Strutting
a b
PLAN
7. D e ta i l a t c ’
Air space
Floor boards
Joist
Wall
Wall plate Ceiling
8. Section on ab
Joist
Wedges
Floor boards
300 – 400 mm
Herring bone strutting
9.
10. D o u b l e j o i s t t i m b e r f l o o rs 3
1.8m to 2.4m
3.6 to 7.5m
300mm
Binders
Bridging joist
@ 300 mm c/c
PLAN
11. Methods of fixing binders with joists
Floor boards
Notched joint
Bridging Joist Bridging Joist
Cogged Binders
Joint
Fillet
12. D i s a d va n ta g e s
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 Bridging Joist
height of the room is decreased.
Binders
13. Fr a m e d o r t r i p l e j o i s t t i m b e r f l o o r s 4
Bridging joist
Binders
More than 7.5m
3m
Girders
PLAN
14. D e ta i l s o f f r a m e d t i m b e r f l o o r s
Floor boards
Bridging joists
Furring piece
Girders
Binder Binder
Ceiling
Tusk and tenon joint
Ceiling joist
15. Single joist Double joist Triple joist
(framed)
3.6 to 7.5m More than 7.5m
Below 3 m
Bridging joist
Strutting
Joist
Bridging joist
1.8m to 2.4m
Binders
Girder
Binder
16. Floor boards :
Pugging:
• @ top of the bridging joist
• In order to make timber floor sound proof.
• Width : 100 – 200mm
• Pugging plaster – mixture of chopped
• Thk : 20 – 40mm
straw & mortar.
• When subjected to heavy
• Insulated boards are supported on fillets.
traffic - thk: 60- 80mm
Floor ceiling :
Bridging joists
• Underside of the floor, improve
appearance.
Fillets • Plaster boards, asbestos cement sheets.
Insulating boards
• Rest on the bridging joists / binders.
