Roof types

[duncb]

Hi,
I have searched through various subjects but cannot find a simple answer,
My question may be a stupid one to some of he experts out there but may help me in future,

What is the difference between a warm roof and a cold roof constuction, what is the definition of either, i have a slate pitched roof, which is this likely to be.

Sorry if this is silly question but if you dont ask you will never know.
Thanks Dunc

 

[justlead1]

i. Until you add insulation and where, determines whether is cold or warm. So please expand the question.

 

[duncb]

i. Until you add insulation and where, determines whether is cold or warm. So please expand the question.

The reason i was asking was more out of curiosity than having an actual problem, at the moment the insulation is between the ceiling rafters, if i understand things correctly is this classed as a cold roof situation, where as a warm room has insulation on the roofing joist.

Answers in laymans terms please.

 

[noseall]

You are correct in assuming a warm roof describes an insulation scenario whereby the insulation sits wholly above the rafters.

Once you introduce the insulation below and/or between the rafters, it leaves the air within the roof space, able to meet cold surfaces.

Once this happens you then need to vent the air to the outside.