How much ventilation under floor is enough?

[aveatry]

Could anyone suggest how thick the twine should be and the spacing needed to stop the insulation sagging? It’s Knauf 44 100mm. Thanks

Nylon crab line

 

[SJRSJR]

Thanks, so are you saying the finer the better? I was about to buy this: Baling twine

Wasn’t sure how thick or how big the gaps should be.

 

[endecotp]

I’d not use fishing line, I’d worry it would slip under the staples. Basically, anything that won’t rot and that you can staple or otherwise fix in place. I confess, when I wrote “baler twine” I actually meant “bale strapping” but either would be fine.

 

[nero44]

funnily enough this is exactly what I am working on as well. I highly recommend to do a proper job even though it is pain to crawl. Previous owner of my place (or their builder) thought it would be best to just dump a lot of building material into the void to hold up the fibreglass wool.. I am currently clearing everything out and using light netting to hold everything back up. Empty spots I use some leftover rockwool slabs which stay in place w/out (but I will still add netting).

I am using this and it works perfectly fine. Having a cordless staple gun makes this much easier (I purchased on solely for this).

 

[SJRSJR]

Thanks for the replies. Would fish pond /bird netting be up to the job?

 

[SJRSJR]

I am using this and it works perfectly fine.

Sorry, I was reading on my phone and didn’t notice the link. Thank you, that’s very helpful