MikeGrahamT21 Posted October 2, 2019 Posted October 2, 2019 Hi ive just got a load of kingspan k112 100mm phenolic board quite cheap. Foil on one side and fibreglass on other. any issues using it as the 100mm in between the ceiling joists? bungalow so only got one floor and it’s a cold roof loft. cheers Mike
MikeGrahamT21 Posted October 2, 2019 Author Posted October 2, 2019 4 minutes ago, Russell griffiths said: Sell it on and buy loft roll. ive plenty of other uses for it if it’s not suitable for whatever reason, but if it’s suitable I’d like to use it as my base layer as it saves me laying a VCL
Russell griffiths Posted October 2, 2019 Posted October 2, 2019 Will be a massive pita to cut and fit, then you need to tape it all up to provide your vapour control, then you need to go over it anyway as I don’t believe it will meet building regs. Loft roll is cheap and easy to install, so is a vapour barrier. Only my opinion obviously.
MikeGrahamT21 Posted October 2, 2019 Author Posted October 2, 2019 Yeah that’s fine, I need something to keep me occupied over winter, you may or may not have read that I lost my wife in the summer, so anything to keep busy no matter how tedious is welcome ?
Russell griffiths Posted October 2, 2019 Posted October 2, 2019 Very sorry to hear that Mike, if you fancy a break come for a visit, russ.
MikeGrahamT21 Posted October 2, 2019 Author Posted October 2, 2019 (edited) that’s very kind Where abouts are you? edit: just seen Gloucestershire, I’m not sure where abouts that is without looking apart from south from me Edited October 2, 2019 by MikeGrahamT21
A_L Posted October 2, 2019 Posted October 2, 2019 4 hours ago, MikeGrahamT21 said: any issues using it as the 100mm in between the ceiling joists? Just make sure the foil is on the warm side of the board and no other insulation below it
MikeGrahamT21 Posted October 3, 2019 Author Posted October 3, 2019 I was having a think about that... Obviously thats totally possible, i can get it up against the plasterboard, but there has to be an air gap for the foil to work doesn't there, otherwise it just acts as a conductor. So on that basis, making an air gap isn't really do-able, nor would it be easy to seal, so was going to have the foil on other side just to act as a VCL. Thoughts?
A_L Posted October 3, 2019 Posted October 3, 2019 11 hours ago, MikeGrahamT21 said: I was having a think about that... Obviously thats totally possible, i can get it up against the plasterboard, but there has to be an air gap for the foil to work doesn't there, otherwise it just acts as a conductor. So on that basis, making an air gap isn't really do-able, nor would it be easy to seal, so was going to have the foil on other side just to act as a VCL. Thoughts? I was thinking you were putting the Phenolic between the joists like normal 'loft roll'. Putting the foil on the warm side would eliminate the possibility of interstitial condensation within the board. This would also apply to your suggested build-up
MikeGrahamT21 Posted October 4, 2019 Author Posted October 4, 2019 Yeah the phenolic are going between the joists, then loft roll on top. will put the foil nearest to the rooms below for the VCL
MikeGrahamT21 Posted October 5, 2019 Author Posted October 5, 2019 Well I’ve made a start on it yesterday, my god there’s some crap up there, going to be a fair few trips to the recycle centre I think! Done 2 insulation boards worth in the eaves, wanted to do the most horrible bits first and to get some of the mountain of boards used up so I can move things around to give me space to take the chipboard up, the joys of doing work in a lived in house! carrying on today and tomorrow then I’ve booked some time off work to make more progress later in the month
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