Flat roofing

[njc110381]

Hey guys. I've got my new garage up and ready for a roof and I'm thinking I'm going to have a flat roof. I've been looking around on the 'net and have found a rubber sheet that's a DIY install. Prices seem to come in at about £15 per m2 for the kit and the installation looks fairly easy. Has anyone tried this stuff? Better still do we have any flat roofers on the forum who'd be willing to advise? The garage is 7.5x4.5m, so about 34m2.

 

Also, would anyone be willing to give me a rough guide price of what it would cost to come and finish the roof with tar and felt? I will have done all the boarding myself so it will just need the waterproof coat on the top.

 

I've asked for quotes but nobody's got back to me yet. It's doing my head in because I'd really like to have a rough idea what it's going to cost me!

[al4x]

at a guess not much more than that it would be a days work max to felt that. I've got a far smaller one and I'm looking at £300 max with it all prepped.

 

p.s don't sorget it needs a slope on it :blink:

Edited April 27, 2010 by al4x

[njc110381]

Thanks for that Al4x. One of the guys who came out to quote suggested that I needed a 2" or so fall from one side to the other, but cheers for mentioning it! Before I spoke to him I did actually assume it needed to be flat! :blink:

[Paddy Galore!]

hi njc, depends on the type of felt, between £10 & £50 per roll. you'll need 4-5 rolls depending which way it slopes. ther isn't even a days work there so labour £150 max.

[brian28]

Quote I will have done all the boarding myself so it will just need the waterproof coat on the top. end quote

hope you put fairings on before ply and have you got facia and tilt on ready .

[artschool]

dont know if this applies to you but if you plan on insulating be careful about condensation due to lack of ventilation.

 

depending on how good a job you wanted doing you could look at a sarnafil type single ply membrane.

Edited April 27, 2010 by artschool

[Fisherman Mike]

To have a local company use a high performance 3 layer felt roof such as Andersons would be around 25 - 35 pounds per m2 on to a prepared substrate. This would give you something with 20 year life expectancy

 

Normally you would get the fall by placing tapered firrings onto the top of the level joists and then boarding on top of that. I assume because its a garage you are not going to insulate it.

 

The butyl rubber sheet is Ok but it can be a ****** to finish off effectively at eaves level also if you do it yourself you have no guarrantee.

 

Ive PM'd you with a number of a local Roofing Contractor who we have used for over 25 years who might be able to give you a quote and some sound advice.

 

Mike.

[vampire]

I do a lot of flat roofing for customers,i would use ruberoid torch on consisting of one underlay and one top coat laid in the opposing direction

You could hire the torch/gas

felt per roll is either 8m2 or 16m2 depending on brand and costs from £25 upwards

1,lay under felt torched on in the opposing direction to final fall of roof, to all upward facing surfaces

2,cut 300mm wide strips of top coat and nail these to the facia,turn drip to front(gutter face) over onto underlay and linked ready to fold sides in

3,lay top coat torched on,starting from gutter and working back(some people fold over the sides and lay top coat upto them),or as item 4

4,fold over side strips onto top folding in corners

 

NOTE;it would be advisable to have a burns kit,fire extingiuisher handy on roof just in case and wear gloves cause it hurts when the bitu burns and sticks to your skin :blink: ,oh and dont wear flamable boots trousers ,and your boots will be covered in bitu so dont wear your best sandles

 

When i first started doing roof,i had;

nearly fallen off roof

burnt my trousers

burnt my boots

burnt my hands

set fire to the roof

over burnt the felt

burnt cables

melted gutters

had leaks

 

So take care and do properly first time.

ATB

Karl

[njc110381]

Well I'm not touching it with a burner that's for sure! If I do my own it will be rubber and cold fix, but in all fairness that looks rubbish! It's all down to cost at the moment though so perhaps a cheaper option to be replaced in say ten years might be the only way viable. I'd love to have the best I can but at the same time if I spend the money that has to go on the bills I wont be living here to worry about that anyway! :blink:

[Yellow Bear]

Well I'm not touching it with a burner that's for sure! If I do my own it will be rubber and cold fix, but in all fairness that looks rubbish! It's all down to cost at the moment though so perhaps a cheaper option to be replaced in say ten years might be the only way viable. I'd love to have the best I can but at the same time if I spend the money that has to go on the bills I wont be living here to worry about that anyway! :thumbs:

 

 

Try Glass fibre and resin - been on 15 years with no problems - did the jobe with the mrs in 2 days but twice the size.

 

1 coat base then fibre and resin a further bonding coat and then a top coat. 1 tip - don't kneel on ot when wet

 

It works for boats to keep the water out - why not a roof.

 

D

[Cookiemonsterandmerlin.]

Have you thought about a quality metal corragated sheets I fitted some to my garage it srews in with torx head bolts with waterproof washers they fit it to cowsheds its a company called golden M .

 

If you let me know nick I get massive trade discount and you could come over and collect it with me as I am not a million miles away.

 

PM me if you want to know more info.

 

LINKVisit My Website

 

Cheers OTH

[kingnewport]

yer fiberglass it , me and a mate did it, took 2 days and cost around £300 (roughly the same size) and that included everything. really easy to to but is messy

[deny essex]

Glassfibre has been my job for over 40 years, Ive layed many roofs domestic , commercial and theme park as well as many moulded items.

It is not difficult as already said care should be taken with the raw material they can be dangerous, follow any safety instructions and common sense and it will give you a hardwearing surface that can be walked on if nessesary.

Any future modifications or repairs can easily be carried out and sealed to the original material with minimal preparation. Colourof the final top coat can be by choice dependant on the material supplier, decorative chipping can be added with an additional top coat if required.

No expensive tools are required, reasonable quality disposable paint rollers are suitable and a cple of brushes.

It can be messy but not too bad if you take care , but count any clothes and items comming into contact with the material as disposable. It does kick up quite a smell of styrene in its liquid form which can affect some people with headaches , nausea etc evn when used outside but as the resin hardens the smell goes.