Flat Roof Re-Felting

luckwudaveit

I have an extension with a flat roof, measuring 6m x 3m approx. The previous owner says it was re-felted about a year before we purchased the house (in 2007), but after 2 harsh winters, it is showing signs of wear, although no leaks (touch wood...)

I would appreciate it if anyone could give me a ball park figure of how much it would likely cost to re-felt it. We don't have the money to pay for it now, but would like to put some aside monthly in the hopes of getting it done in the spring of 2013.

Thanks for any advice.

RubiqQb

I am buying a house that needs exactly the same done to a rear extension and more or less the same size. I wasn't given a quote by any means but a builder friend said certainly no more than £800, I would however be interested to hear other people's opinions!

Phil_L_2

£1200 including insulation.

WLM21

luckwudaveit wrote: »

I have an extension with a flat roof, measuring 6m x 3m approx. The previous owner says it was re-felted about a year before we purchased the house (in 2007), but after 2 harsh winters, it is showing signs of wear, although no leaks (touch wood...)

I would appreciate it if anyone could give me a ball park figure of how much it would likely cost to re-felt it. We don't have the money to pay for it now, but would like to put some aside monthly in the hopes of getting it done in the spring of 2013.

Thanks for any advice.

My garage roof was leaking so I gave it two coats of this, simply because I couldn't afford to have it recovered at the time.

http://www.thompsonsweatherproofing.co.uk/products/product.jsp?id=16

It has worked very well, even with water lying on the roof, there are no leaks. It is easy to paint on ... just do it on a nice dry day and brush off any dust first.

Due to subsidence, the roof is not falling as it once did, so when I do get the roof fixed, it'll be a fair bit of dosh .. hence the wait

There is cheaper stuff at Wilkinson's but the branded version is much better in my opinion

ormus

i got my flat roof repaired for 250 quid. bout 5 yrs ago.
got the roofer in recently and he said i may need it doing completely next year.
back to the joists. 800-1200 quid.

luckwudaveit

Thanks so far for all the responses.

slipperyshoe

Regarding cost:

-£30-£35/m2 for a one man band to strip and lay a new 2 layer high performance felt

-£60-£65/m2 - For a one man band to strip and lay a new insulated system using 120mm PIR insulation (I would always get it insulated and you are breaking building regs if you don't (though you wont get caught))

£55/m2 for a decent company to come in and install 2 layers

£85/m2 for a decent company to come in and install insulated system

£100-£160m2 for an all singing all dancing 20-25 yr insurance backed guarantee as described above. Manufacturer will write spec and perform final inspection (i.e. will ensure works are top quality).

All prices are plus VAT if the company is VAT registered.

There is nothing wrong with a one man band doing it as ling as he is trust worthy. If you don't know anyone I would suggest you don't go down that route.

On another note I would expect the last option to last 35 years and the first one to last no less than 10 (hopefully 15-20). Either way if yours was done in 2006 it should have plenty of life in it.

regards

poggs

I have a 1977 wimpey home which has a 4' x 4' porch at the front door acting as a shelter really with a light etc.

The flat roof on this porch is totally rotten and leaks into the square area resulting in the light filling with water and failing.

Looking from above, there is limited felt left on the roof and I can see boards etc in places. Guessing this needs stripped back and fully replaced.

Roughly how much to replace and fix such a roof?

geordie458

EPDM might last longer. Just a thought.

travellerboy

Don't make the mistake of renewing the roof with FELT. Felt is a cheap and nasty solution, it will always fail causing water damage and further expense. Turn the clocks back and it was about the only economic soultion to weatherproofing a flat roof, but today modern flexible material are available which far exceed the life expectancy of the normal 10yr life of Felt. EPDM is just one example (cost about £25-£30sq.mtr)

Also many flat roofs fail from condensation, rotting from the inside rather than outside. For a longer term solution change the roof to a Hot Roof design and choose a top layer that is flexible and free to move with the building's normal thermal movements, then it is more likely to last.

It may cost a little extra but will be a life time solution.

slipperyshoe

travellerboy wrote: »

Don't make the mistake of renewing the roof with FELT. Felt is a cheap and nasty solution, it will always fail causing water damage and further expense. Turn the clocks back and it was about the only economic soultion to weatherproofing a flat roof, but today modern flexible material are available which far exceed the life expectancy of the normal 10yr life of Felt. EPDM is just one example (cost about £25-£30sq.mtr)

Also many flat roofs fail from condensation, rotting from the inside rather than outside. For a longer term solution change the roof to a Hot Roof design and choose a top layer that is flexible and free to move with the building's normal thermal movements, then it is more likely to last.

It may cost a little extra but will be a life time solution.

I have come across you talking utter nonsense on felt before, you should refrain from advising on things you know nothing about. The BBA (British Board of Agrement) is the accepted testing body within the entire construction industry. The durability statement for some of the bituminous felts is 30yrs+ (meaning it has a certified lifespan of 30yrs+). To my knowledge there is no EPDM that has a 30yr durability, not one.