June 25, 20224 yr Trying to decide whether to fit an internal VCL for our SIPs build... How essential is an internal VCL to achieve airtightness and maintain the health of the internal OSB sheets on the SIP panels? Our building inspector seems to think polythene sheeting would suffice? I'm thinking something like Tyvek Airguard Reflective or Novia VC200 Reflective. Thoughts welcome please? JAS
June 25, 20224 yr I fitted one and achieved 0.2ACH. The technical docs say you don't have to fit one, I saw it as erring on the side of caution. If doing a build again, I would still install a VCL. I think @SuperJohnGfitted one with his SIP build too.
June 25, 20224 yr We are using the Intello product for ours, mainly because it has the capacity to be two way and is strong enough to contain the blown insulation. When we had a WuFi analysis done there was a section on the North wall where it could get difficult but with the Intello it all worked out OK. Edited June 25, 20224 yr by MikeSharp01 product name wrong
June 25, 20224 yr Author 1 hour ago, LA3222 said: I fitted one and achieved 0.2ACH. The technical docs say you don't have to fit one, I saw it as erring on the side of caution. If doing a build again, I would still install a VCL. I think @SuperJohnGfitted one with his SIP build too. Thank you for this reply. What product did you go with please?
June 25, 20224 yr I have also used the Novia product in the garden room build but it's not quite as well made as the Intellio product but it works perfectly well.
June 25, 20224 yr 2 hours ago, JAS-Build said: Thank you for this reply. What product did you go with please? Intello
June 25, 20224 yr 2 minutes ago, SuperJohnG said: I went intello also. Bought from Germany 🇩🇪. Just done today. How did you find it in the end? Its easy enough but I found it repetitive and tedius. Cutting PIR insulation is a horrible job - gets everywhere.
June 25, 20224 yr 6 minutes ago, LA3222 said: How did you find it in the end? Its easy enough but I found it repetitive and tedius. Cutting PIR insulation is a horrible job - gets everywhere. I started myself and done a room...was long but today my mate helped who runs a company and brought 7 guys with him. Done full house nearly in a day. Maybe done 90% which has saved me maybe 2 months.
June 25, 20224 yr 11 hours ago, LA3222 said: Intello Yep thanks all fixed. We got the 3m wide Intello to speed things up a bit, harder to handle but covers with fewer seams and about twice as fast.
June 25, 20224 yr I used the Protect Barriair, very similar to the Intello but without the webbing built in so not quite as strong, but a lot cheaper. TIP: This comes with built in adhesive tape but do not trust that, use a good air tight tape as well at the jonints. This comes in a 2 metre wide roll.
June 26, 20224 yr 8 hours ago, SuperJohnG said: I started myself and done a room...was long but today my mate helped who runs a company and brought 7 guys with him. Done full house nearly in a day. Maybe done 90% which has saved me maybe 2 months. Nice one bud. That's a stroke of luck being able to get that job nipped so quick👍
June 26, 20224 yr 4 hours ago, LA3222 said: Nice one bud. That's a stroke of luck being able to get that job nipped so quick👍 For sure. Now I'm left to wrestle the airtightness though...these bloody vaulted ceilings are going to be lovely, but they are murder.
June 26, 20224 yr 4 hours ago, SuperJohnG said: For sure. Now I'm left to wrestle the airtightness though...these bloody vaulted ceilings are going to be lovely, but they are murder. I started at the ridge, fixed a strip of AT membrane in place with a batten (start of service void) then worked down the wall. All single handed. It does feel like trying to put up a massive tent from the inside. Scaffold down the middle to work from and reach the ridge, worked from planks and trestles lower down. If the service void battens don't line up with the self adhesive joints, tape with proper AT tape.
June 26, 20224 yr 18 hours ago, LA3222 said: How did you find it in the end? Its easy enough but I found it repetitive and tedius. Cutting PIR insulation is a horrible job - gets everywhere. Excellent. Now get your DIY blower door fan rigged up and you're sorted.
June 27, 20224 yr Author I see lots of airtight VCL here but not many are reflective - is there a reason for that? Thanks, Jas
June 27, 20224 yr Mostly marketing. There can be a benefit to using them in attic spaces below lightweight roofs in very sunny climates to reflect some heat away and reduce overheating. In theory when paired with a suitable airspace internally the reflect some heat back into the house. The effect is miniscule however. I'd just make sure you buy a robust and durable membrane. I was quite happy with this one. https://justairtight.ie/f-air-tightness®-membrane-EXTRA-1-5-x-50m-CE-certified-p161302002
Create an account or sign in to comment