Concrete Garages

[mexlad 189]

Anyone got a concrete sectional garage ?, I've just bought one and wondered if there was anyway of insulating them and I've heard they can get condensation on the roof is there any spray or anything to stop this ?, I will be getting a log burner in it so I expect this to make it worse any help would be great

 

Cheers mexlad

[Hot Meat 3,109]

we got a big un in inlaws garden mate, started off as a workshop now its a bar/manshed, we usec kingspan in the recesses in the sections, then kingspan over the whoole walls, then lined it with chipboard, but when we put tiles up we noticed condinsation dripping down from the tin roof, long story short we ended up putting an extractor fan in roof lol after loads of fooking about thats what stopped it

[Lab 10,979]

Google "Touch 'n' Foam" mate..............

[just jack 998]

vents mate it needs to breath

[NEWKID 27,132]

You can get anti condensing roof sheets mate, they have a type of felt backing on the underside, this traps the condensation. The bottom of the sheet ( into the gutter, or eaves end) has the felt cut off ( about 100mm, 4"), the condensation runs down the felt and drips into the gutter...

I can't remember the exact figure but it's something like 1litre of water can be trapped in 1m of sheet..

 

They're very effective ( we replace all council garages with them now) and not that expensive ( around £10.00m2)...

 

You can still use fibre cement sheets, which breathe unlike tin which will always condensate..

[Hot Meat 3,109]

never knew that cheers, its been solved now tho but im thinking of putting another in so will keep them in mind

[NEWKID 27,132]

You still need to allow air to circulate, if you want to put fillers top or bottom you need vented fillers...

 

This is off of United Roofing Products web site where I tend to buy ours

[IanB 0]

A house normally has a vapour membrane and insulation if for example your retro converting a garage with single skin, the same applies to a shed. I'm not 100% sure on vents as it defeats the purpose of keeping the shed/garage a warm area. Insulate the roof and use a membrane.

[just jack 998]

its like a loft, insulate what you need and vent the rest

[NEWKID 27,132]

If you start getting into insulated systems you start looking at a bit of money,

For 40mm composite panels ( the quickest and easiest way to lay insulated sheets) you be looking at around £ 21- £23 m2, with plus carriage charges..

You could use a built up system, liner, support bar, insulation, top sheet.. The materials would be cheaper but it's quite labour intensive,

 

For a bog standard garage, shed you can't beat anti con sheets..

 

Edited to say,

 

Don't insulate between the purlins, you will get breaks in the insulation that will cause condensation..

 

If you are going to insulate, insulate above..

Edited September 23, 2013 by NEWKID

[Qbgrey 4,089]

newkids bob on.you can wrap a building up tight in insulation ,but without vents it will go mouldy.dont touch the inside concrete wall with insulation,same with roof allways leave a gap for air,with vents.