Recent content by HarryC89

As they've said above you are talking about ventilating an unheated area so the vents will not contribute to heat loss in any meaningful way. Condensation will compromise the ability of the insulation to do its job.

Sorry I can't really comment on flat roofs as thats a different kettle of fish and lots of differing opinions! Hopefully someone else can help though

I can't comment on the tile vents sorry! it's usually soffit vents plus ridge vents which allows for cross ventilation. When a envelope (floor / wall / roof) is poorly insulated more heat escapes through it more quickly. So the difference in surface temp between the inside and the outside of...

It's not something I've done myself but I do SAP EPCs for a living and can tell you that all new build houses will ventilated the soffits for a cold pitched roof so take from that what you will. Condensation is worse when insulation is higher because the difference in temperature between the...

oops , ignore this.

Also I think there are probably calculations out there to say how much soffit ventilation per m2 of loft space but I don't -think- you can really have too much, at the end of the day the loft is an unconditioned space and outside the heated envelope so you shouldn't be concerned about soffit...

Condensation risk is lower when there is less insulation. So increasing insulation can actually cause condensation problems when they weren't present before. If you have a cold roof (e.g. insulation between and over joists, loft space unconditioned) then it should be ventilated at the soffits...

I forgot to add, below the space there is no kitchen / bathroom (different part of the house which is timber frame). Wood burning stove downstairs so the air is pretty dry over colder months. There is a large square opening in picture 2 currently jammed with mineral wool (hole for a hay hitch)...

I'm actually in Sweden but I'm a brit so thought I'd try on this forum. We have an old (150 yr old) log cabin which I am renovating, currently insulating the upstairs. 2 x 4 stud walls with 100mm celotex between studs, VCL, then 50mm Celotex over studs. The walls are very uneven so there is a...