Loft Conversion

How to board and insulate a loft

Anonymous user 28/02/2024 - 2.58 PM

In my previous house, I laid rockwool between the joists of my loft and then used the tongue and groove B&Q boarding to board over it. In my new house, I was planning on doing similar but not using rockwool, instead using Warmcel 100 Insulation to the depth of the joists about 3 inches and using Wickes tongue and groove loft boarding to put on that. Avoiding light fixtures and keeping electric cables above the boards. I'm not looking for the perfect 10 inch insulation I just want some insulation and the loft boarded. I was reading though that you should leave some space for air to flow beneath the boards to avoid condensation etc. So if I only did 2 inches of insulation and boarded over it? Does not seem like much to me. Also on here I read someone suggested using solid insulation boards over the joists and no insulation between them. Is that right, could you just board your loft with solid insulation boards and that is safe to crawl about on, or would you lay the insulation boards and then put loft panels over that? Any professional advice would help.