How To Fit Loft Floor Joists

The best solution is to build a raised loft floor above the insulation details of which are shown below.

How to fit loft floor joists.

With the supporting ashlering in place the internal struts and braces can now safely be removed. Loft conversion part 4 fit and cut more joists joist. In smaller lofts it is often the case that the floor joists themselves will be used to support the sloping rafters. Also nail each sister to the top of the exterior wall and any supporting walls or beams.

Your sub floor joists should be at 400mm centres meaning the edge of the boards always falls on a joist too. Furthermore squashing insulation down to fit joist height is a bad idea as this halves it s effectiveness doubling your heat loss. Joist hangers only proprietary joist hangers complying with bs 6178 part 1 1999 or bs en 845 1 can be used subject to the manufacturer s. Continue to lay chipboard flooring across the joists for the rest of the floor ensuring the joints along the 600mm edges are staggered always avoid joining on the same joist wherever possible.

A basic floor system is installed in about 10 stages from preparation to boarding the floor. Install the sister joists. Nail the sister to its mating joist with 10d common nails. This is possible by constructing a dwarf timber stud wall 1m to 1 5m high known as an ashlering between the two.

It is now a requirement to limit air leakage from the inside of buildings one main area where this situation can be improved is to effectively seal the gaps around floor joists where they bear into the external walls. This can be done in two ways. A new floor system is installed using a frame trimmer joists to support the floor joists that span the width of the loft. Fit each new joist in place next to an old joist so their faces make full contact and their top edges are flush.