Vapour Barrier Suspended Timber Floor Construction Detail

Moisture management for suspended timber floor construction many suspended timber floor constructions have discontinuous insulation between the joists.

Vapour barrier suspended timber floor construction detail.

Vcls or vapour barriers will only reduce the vapour movement to an acceptable level. A damp proof membrane or dpm is a waterproof barrier that s introduced between your sub floor and your wood floor. My plan is to remove the floor boards using some scaffolding netting stapled between the joists up and over up and over to hold some fibreglass insulation clean out any excess rubble and double check the air bricks. This barrier is intended to stop moisture passing from one to the other.

However vapour barrier specification and details together with those for dpc and dpm are only mentioned in relation to the two generic floor construction types of suspended timber floors and concrete slab on ground in e2 as1 section 10 0 floors. Suspended timber floors required under clause h1 energy efficiency. Some people and organisations will refer to the material that controls vapour movement as a vcl and some will call it a vapour barrier. Water vapor can pass through building materials in several ways including direct transmission and by heat transfer but studies suggest that fully 98 percent of the moisture transfer through walls occurs through air gaps including cracks around electrical fixtures and outlets and gaps along baseboards.

Previously floor timbers had been prone to damp and rot thanks to their direct contact with the moist ground. Effectively a thick plastic sheet a damp proof membrane dpm is used to create a barrier between a concrete or screed subfloor and a wood floor. The seams must be sealed with tape and the edges of the foil should overlap a little a few inches. It is important to remember that no material is completely vapour proof so the term barrier can be slightly misleading.

A vapour barrier can easily be realised with a plastic foil like polythene at least 0 2 mm thick. Thus installing vapor barriers on wall surfaces must. Hi i did just like to check my plan for installing some insulation in a timber joisted suspended wooden floor in a 1900 ish terraced house. That leaves an opening to improve moisture management and airtightness by fitting a tyvek membrane and carefully sealing the gaps and joints.

This can be attached with staples beneath the rafters or trusses on the inside. At the turn of the 18th century when construction techniques moved from boarded floors installed directly on the ground to suspended timber floors over a ventilated chamber the innovation solved a significant problem.