How To Fit Loft Floor Joists

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.

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. Loft conversion part 4 fit and cut more joists joist. Loft conversion floor joist spans see description you attic flooring 101 all you need to know bob vila beefing up attic joists for living e jlc online can you convert your attic to living e board vellum. 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.

This can be done in two ways. Clearing the loft area of all debris insulation struts and temporary boards to expose the ceiling boards. Your sub floor joists should be at 400mm centres meaning the edge of the boards always falls on a joist too. In smaller lofts it is often the case that the floor joists themselves will be used to support the sloping rafters.

You can still board directly on to the joists if you want but it is worth noting that this would not. 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. Furthermore squashing insulation down to fit joist height is a bad idea as this halves it s effectiveness doubling your heat loss.

With the supporting ashlering in place the internal struts and braces can now safely be removed. A new floor system is installed using a frame trimmer joists to support the floor joists that span the width of the loft. Install the sister joists. Fit each new joist in place next to an old joist so their faces make full contact and their top edges are flush.