NickK Posted January 6, 2021 Share Posted January 6, 2021 Hi, Has anyone got experience with these?? https://www.amazon.co.uk/Vents-Prevents-Condensation-Attic-Ventilation/dp/B00M97O5YY/ref=mp_s_a_1_1?dchild=1&keywords=felt+lap+vents&qid=1609955428&sprefix=felt+la&sr=8-1 We have quite a bit of condensation in our loft and soffit vents are clearly not enough. Are these any good? Thanks Link to comment Share on other sites More sharing options...
PeterW Posted January 6, 2021 Share Posted January 6, 2021 Short lengths of overflow pipe work just as well and much cheaper ! Link to comment Share on other sites More sharing options...
nod Posted January 6, 2021 Share Posted January 6, 2021 I’ve just fitted ten at my daughters Manthorope I think Time will tell if they have done the job As Peter has already said A bit of overflow pipe would have done exactly the same job Link to comment Share on other sites More sharing options...
NickK Posted January 6, 2021 Author Share Posted January 6, 2021 @PeterW do you just a tiny overflow pipe for loft water tank for example? Link to comment Share on other sites More sharing options...
epsilonGreedy Posted January 6, 2021 Share Posted January 6, 2021 1 hour ago, NickK said: We have quite a bit of condensation in our loft and soffit vents are clearly not enough. Are these any good? Do you have the type of soffit vents that create an air channel between the soffit and up above the insulation roll level? Link to comment Share on other sites More sharing options...
NickK Posted January 6, 2021 Author Share Posted January 6, 2021 I do but at both front and back of the house and it isn’t covered insulation rolls...I guess simply not enough to for this time of the year??? Link to comment Share on other sites More sharing options...
Temp Posted January 7, 2021 Share Posted January 7, 2021 Interesting to calculate how many of the round eaves vents you need to meet the recommendations in regs. If the insulation is at joist level they recommend the equivalent of a 10mm wide slot so that's 10,000 sqmm per meter. Typical round vent has a free area or just over 2000 sqmm so you need 5 per meter or say 2 per rafter bay. If the insulation is between and under rafters its a 25mm slot, 25000 sqmm per meter or 12 round vents per meter. Something like 5 per rafter bay. Link to comment Share on other sites More sharing options...
PeterW Posted January 7, 2021 Share Posted January 7, 2021 5 hours ago, NickK said: @PeterW do you just a tiny overflow pipe for loft water tank for example? Yep - couple of bits every other bay both sides of the roof. Your vents aren’t that big, needs a low flow not a gale Link to comment Share on other sites More sharing options...
tonyshouse Posted January 7, 2021 Share Posted January 7, 2021 I sometimes have pushed off cuts of pipe in the lap to increase ventilation - free and no downside though I worry about bats, bees and wasps using them Link to comment Share on other sites More sharing options...
MikeGrahamT21 Posted January 7, 2021 Share Posted January 7, 2021 I used offcuts of PIR/EPS, cut into wedges, does the job Link to comment Share on other sites More sharing options...
NickK Posted January 7, 2021 Author Share Posted January 7, 2021 Thank you everyone. I’ll have a go later today. Link to comment Share on other sites More sharing options...
NickK Posted January 11, 2021 Author Share Posted January 11, 2021 @PeterW Just wanted to report and say thank you. Little over 3 days in and condensation is almost gone after installing overflow pipe cut-offs. Top job. 2 Link to comment Share on other sites More sharing options...
Jilly Posted January 11, 2021 Share Posted January 11, 2021 On 06/01/2021 at 17:57, PeterW said: Short lengths of overflow pipe work just as well and much cheaper ! Sorry to be thick but could you draw what you mean, please? I think this might help me too but I can't visualise how.. Link to comment Share on other sites More sharing options...
Gav_P Posted January 11, 2021 Share Posted January 11, 2021 1 hour ago, Jilly said: Sorry to be thick but could you draw what you mean, please? I think this might help me too but I can't visualise how.. I’m guessing a bit like this from a quick google search Link to comment Share on other sites More sharing options...
Jilly Posted January 11, 2021 Share Posted January 11, 2021 Ahh, OK. Thank you. I'm worried about hidden condensation in the vaulted ceiling Link to comment Share on other sites More sharing options...
PeterW Posted January 11, 2021 Share Posted January 11, 2021 21 minutes ago, Jilly said: Ahh, OK. Thank you. I'm worried about hidden condensation in the vaulted ceiling Can’t use it for that. You need to use a proper breather membrane and a vapour barrier below the insulation. Link to comment Share on other sites More sharing options...
Jilly Posted January 12, 2021 Share Posted January 12, 2021 Mmm, I need to do more research, I'll do a separate post to explain. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now