flat roof to angled?
Author
Discussion

asfault

Original Poster:

13,211 posts

195 months

Sunday 5th January
quotequote all
what sort of cost is involved in getting a single garage changed from a felt flat roof to angled or even adding in slate? seems it would solve alot of long term maintainence issues and insulate better?

Andeh1

7,344 posts

222 months

Sunday 5th January
quotequote all
A good few thousand, also likely to need to look at planning permission and who would design and supply it, and install it!

Just get it reroofed with a single ply membrane. 25 year guarantee.

jonathan_roberts

543 posts

24 months

Sunday 5th January
quotequote all
asfault said:
what sort of cost is involved in getting a single garage changed from a felt flat roof to angled or even adding in slate? seems it would solve alot of long term maintainence issues and insulate better?
You’d probably be better off price wise keeping the roof flat but using something like Restec Flexitec (I’m in the roofing trade and we sell buckets of it for exactly this purpose and it’s great) as a roof waterproofing membrane instead of felt. It can withstand standing water (unlike felt) and as long as it’s laid correctly will last around 20 years.

If the existing substrate is not completely rotten you might even be able to just clean it, then prime it, and go straight over the top with flexitec without needing to remove the felt.

Leaky flat roofs are a thing of the past now with modern liquid membrane waterproofing. Speak to a roofer, but unless you’re thinking of developing the roof space then this would probably be the best option.



Cow Corner

591 posts

46 months

Sunday 5th January
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jonathan_roberts said:
Leaky flat roofs are a thing of the past now with modern liquid membrane waterproofing.
Ha ha ha!

pacenotes

373 posts

160 months

Sunday 5th January
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Flat roofs look crap too. If you want some curb appeal I'd upgrade to angled.

John D.

19,406 posts

225 months

Sunday 5th January
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pacenotes said:
Flat roofs look crap too. If you want some curb appeal I'd upgrade to angled.
Load of money and hassle to make it a pitched roof though.

Just get it re-roofed as other have said.

asfault

Original Poster:

13,211 posts

195 months

Sunday 5th January
quotequote all
Perfect thanks folks.

Aluminati

2,939 posts

74 months

Sunday 5th January
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A lot of comments based on no experience here .

asfault

Original Poster:

13,211 posts

195 months

Sunday 5th January
quotequote all
Aluminati said:
A lot of comments based on no experience here .
Care to give an experienced one for me then?

Lotobear

8,048 posts

144 months

Monday 6th January
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10-15k

Aluminati

2,939 posts

74 months

Monday 6th January
quotequote all
asfault said:
Aluminati said:
A lot of comments based on no experience here .
Care to give an experienced one for me then?
More related to the liquid waffle etc. yes, it’s fairly simple to convert. But…

Planning , gable structure, expense. You can have trusses pre made, which would make install a lot simpler. If you were reasonably handy at diy, it’s not that difficult.

There are enough decent membranes about now to give you comfort. A lot of blue roofs have felt as the waterproofing, which gives you an indication of their robustness, but again, premium is expensive. I currently have a project where I’m paying £120 for a 7.5 m2 roll of mineral.

And the comment about a 25 year warranty for single ply is just , well, bks. You need a manufacturers spec, and it needs to be logged on their system. They won’t do that for a domestic garage.

HBelder

1,713 posts

36 months

Monday 6th January
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Lotobear said:
10-15k
6m x 4m garage.

Trusses £540

Roofing materials (batten, disc rivets, copper nails, clout nails, underlay, dry ridge kits, slates) £1100

Felt support, eves vents £100

ETA, Insulation board £325.

Edited by HBelder on Monday 6th January 17:50