>> I have laid boards before straight onto joists, but has anyone done this after having
>> extra high insulation installed?
>>
>> If so, what method did you use?
In my 1930s house I had previously laid 8'x2' boards on the 4" joists with 100mm of insulation.
A couple of years ago, when the energy companies were heavily subsidising it at B&Q, I bought plenty of rolls of 200mm insulation to increase the total depth of insulation to 300mm.
I looked at the plastic feet but they were expensive and rather restrictive on positioning. So I devised my own system using 150mm timber feet supporting 50x50 horizontal timbers, with the 8'x2' boards re-laid on top.
The timber feet were 75mm lengths cut from some 150x50 joists I had, and screwed diagonally into the joists. The 50x50s were cut down from the same 150x50 joists and screwed to the top of the feet.
I fixed the new 50x50 supports across the joists so I could control the spacing to match the insulation and the boards (and to get vertical and lateral support from the binder/trimmer timbers).
Obviously with your insulation already there you will need to dig a bit to find the joists.
|
