Movement Joints In Timber Floors

Tied joints should be formed using expanded metal wire wall ties or a proprietary equivalent spaced at maximum 300mm intervals.

Movement joints in timber floors.

The timber floor structure will be shown in detail on the plans and drawings. A range of profiles are available including trims for joints within the floor doorway transitions as well as beadings. They reduce impact sound transmission and absorb the movements of the floor assembly. Movement joints accommodate the differential stresses within each field of tiling so they don t build up to a level which would cause shearing stresses at the bonded interface protecting the tiles from cracking tenting and debonding.

Swelling in tongue and groove strip timber flooring is defective if it causes tenting buckling or crowning of the boards and can be seen from a normal viewing position. Timber frame floor cross section is as shown below with maximum 45mm deep timber plates binders. Generally t g timber floors laid over joists or battens will have more spring under foot and there is likely to be some vertical movement at board edges and end matched joints when walked on. Joists plywood on slab etc timber floors will both feel and sound differently when walked on.

Referred to as a movement expansion or stress relieving joint expansion joints are often used when tiling large floors to break up the floor covering in to separate sections. Vertical movement in bonded floors often coincides with a popping sound and is usually caused by failure of adhesion to the sub floor due to excess sub floor moisture insufficient contact between flooring element and the adhesive at time of installation caused by unevenness of sub floor or wrong trowel type. These must be drawn according to sans 10082 which specifies how timber buildings should be built. Perimeter joints are movement joints placed in the screed and the covering along walls and construction elements that penetrate the screed such as columns.

Cork expansion joint in solid timber floor timber expansion trim separating hallway and lounge room in this engineered floor. 15 4 joint swelling in timber plywood and particleboard flooring joints in plywood and particleboard floors are defective if they can be detected through normal floor coverings. Supporting beams or floor joists are fixed in place first usually on wooden wall plates that sit on the brickwork. A tiled surface is similar to a sheet of glass in its rigid nature and this can cause problems when there is movement.

Movement joints movement joints should be included in long lengths of walling to reduce unsightly cracking and detailed so that stability is maintained. It is important to provide ventilation under floorboards.