Ventilation in Vaulted Ceiling

F

Franm

Registered User
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74
Hi All,
I'm about to fit rigid insulation to our vaulted ceiling and am going to maintain the 50mm recommended ventilation gap between the insulation and felt. However I was sizing up the job last night and was wondering if it's necessary to create some sort of gap at the apex of the roof i.e. where the rafters are attached to a central beam. I can't see how the ventilation will pass through to the other side and I was thinking of drilling a few "small" holes near the top of the wide beam to allow some air through.

Is this a good or bad idea? Or do I need to do anything at all re this?

It's a renovation project (yes the same one....) and I'd be reluctant to change anything re ridge tiles or slates.

Regards
Fran
 
Franm said:
Hi All,
I'm about to fit rigid insulation to our vaulted ceiling and am going to maintain the 50mm recommended ventilation gap between the insulation and felt. However I was sizing up the job last night and was wondering if it's necessary to create some sort of gap at the apex of the roof i.e. where the rafters are attached to a central beam. I can't see how the ventilation will pass through to the other side and I was thinking of drilling a few "small" holes near the top of the wide beam to allow some air through.

Is this a good or bad idea? Or do I need to do anything at all re this?

It's a renovation project (yes the same one....) and I'd be reluctant to change anything re ridge tiles or slates.

Regards
Fran
Click to expand...

The ventilation needs to exhaust at the ridge...

http://www.environ.ie/en/Publications/DevelopmentandHousing/BuildingStandards/FileDownLoad,1647,en.pdf

see diagram 6 , part D above
 
Thanks Syd,
Is this via a special ridge tile with ventilation?
Regards
Fran
 
it is generally yes, as your devlopment is a restoration you will need to find a product that matches the existing.
what finish have you?
approx pitch of roof?
if tile, have you half round ridge tiles?
 
It's a slate roof, with a very low pitch of about 20 degrees. (in fact some have commented that it's probably too low a pitch for a slate roof) The roof was replaced some years ago (before we purchased) and we've had no leaks yet (TG). And believe me, it was well tested this summer.
Regards & Thanks
Fran
 
Thanks Syd,
I reckon it's best to go down this route alright.
Regards
Fran
 
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