On 27/06/2019 15:01, Tricky Dicky wrote:
I need to extend the floored area of my loft. The loft consists of trusses supporting the roof which is quite a low pitch so you cannot stand up in it. Previously I attached 3 X 2 cross members to the trusses 300mm above ceiling height so not to compress the insulation. I then used loft boards screwed to the cross members to form the floor. Owing to the variable spacing of the trusses to get the boards short edges to rest on the cross members meant a lot of measuring and cutting wasting a lot of material in the process not to mention time. This time I am thinking of avoiding the cutting so I am thinking of staggering the boards which will mean most of the short ends will end up in space and hoping the T&G of the adjacent boards will provide the support. The flooring is only to provide crawl space whilst I get some wiring done. Anyone done something similar and does it provide adequate support for an overweight not so agile OAP to crawl around and work in?

Richard


I've done exactly the same, but used 2*2 rails, 3.6 metres long,
at 90 degrees to the trusses and elevated above them with home-made
extenders cut from scrap 1 inch plywood, 6 inches wide and a 2*2
notch that the rail sits in, while the bottom of the extenders are
glued and screwed to the trusses.

I managed to get a whole load of scrap 15mm MDF from a B&Q refurb
each 900 * 600 mm. (used to have heating components screwed onto
them for display). Cutting around the zig-zag truss components
was tricky and time consuming but possible with various
packers.

As long as the edges of every flooring section are supported and
fixed, theer should be no problem.

If I was doing it again I would use 15mm OSB because that is
not as heavy as MDF.

You ought to consider the illumination up there. If you extend off
an RCD extended lighting circuit and manage to trip the thing while
up there, while in an awkward position, how will you extricate
yourself ?.