Garage/shed roof advice please

[Burdekin]

How about OSBa layer of felt underlay and felt shingles? I have them on my gazebo and are going strong and look decent as well.

These are the ones I used, much thicker than the shed felt from B&Q for example. https://www.tuin.co.uk/IKO-Felt-Shingles.html

 

[gaz1]

As felt = 18mm OSB = big joists = complete re-build as the walls are not strong enough - materials came out well north of a grand and that's at trade prices.
Had a re-think and am now going for Coroline which is a corrugated, pressure formed bitumen/fibre with a 15 year guarantee. Also it is light and needs no board backing at 10deg pitch, just purlins at 45cm's - which I can put on half as many joists so I only re-make the one wall to make it higher. Still £750 but I need a roof!
As an added bonus if I want a felt/board roof later I can add the walls, extra joists and boards at a later date.

some of your build can be adjusted if you want by building the front in blocks and the rear in blocks the front over the garage door id leave as wood built structure as remains light

the roof option

grp, felt flat roof
both use 18mm board

steel sheet, corrugated roof you will find it drips like a pig in there getting 4 metres of it is going to be fun 2 or 3 metres of it not a problem you will need roofing felt to catch the drips and run them off the roof
now if you can apex the roof you have further options
it works out roughly 2 metres of roof per side of apex

you can also drop down to 11mm boards for grp and also a felt roof

i wouldnt advise going any wider than 16" for your joists as its the maximum center width distance used to be 12" at center of joists

 

[Wightsparks]

The issue is anything heavier than a corrugated sheet will require the whole shed re-building as the present walls will not take the weight of it and it's supporting structure. Felt+OSB will be 445Kg.
Coroline is 50kg for the whole roof. According to the manufacturer it does not need a backing unless it is below 10deg pitch install spec here : http://www.arielplastics.com/~/medi...lation-Guides/Coroline_Installation_Guide.pdf . 10 years will be fine!

Nice looking Gazebo Burdekin!

BTW just in case anyone is thinking about felt for their shed/gazebo roof - don't bother with the "Shed felt" as it is junk - but Travis Perkins have a heavy duty "Torch on" on promo for Jan/Dec at £28+Vat for an 8m roll - having spent a lot of time looking at similar recently I can tell you this is a great price - Supposedly for the trade but I don't see them turning down your money!

 

[addjunkie]

I agree ith back the corruline with sheet even half inch. Also the standard nails from corroline are flimsy, dont really get a bite. I use the wicks nails but always knick them through a dod of black silicone. They are slightly longer by about 15 mm and a heavier shank. Dont over hit them or you can punch them right through.

Did experiment with tec screws but very easy to crush the corrugations. Again on the chicken coup black silicone under the screw head.

Costly but do the job properly you will only do it once.

 

[Wightsparks]

I've ordered a bunch of Coroline screw surrounds with caps only, as I read the nails were not up to much so I will use Galv screws and a light trigger finger!

Unfortunately there is no halfway with this. Anything heavier than the Coroline means a complete re-build, so its not just a few extra quid for the board it is an extra £500 for the structure. Fortunately I live the furthest south you can get without being in France and in a very sheltered part of it.

Thanks for your input everyone!

 

[Wightsparks]

So I tore it down and put it up in one Friday (ok from 9am to midnight!). I prebuilt the rear wall in 2 sections inside the shed then just lifted them into position on the day. The front wall had to be heavily reinforced as it was very flimsy even before I took the old joists down - basically all the weight is now on new structure - you can see the front reinforcements on the right here, the OSB on the floor is the back walls.


Got an Evolution Reciprocating saw for the demolition job - amazing bit of kit, very hefty.

Whole thing is very solid and can get on the roof with crawling boards with no deflection in the Coroline or any issue at all.
Still finishing off weatherboards etc. but pleased with the way it came out.




Thanks everyone for your input.

 

[gaz1]

looks way better i thought you said that back wall was a brick wall?

as it looks like its sheet boarding on outside

for the front end id consider ripping it down and make a whole new front again instead of using addons by the look of it in the long run it will be worth doing it

 

[Ashley Burton]

Looks like you've got a lot more roof height!

 

[Wightsparks]

Now it is re-built from the inside I can re do the front when funds and weather allow.

Yep lots of roof height - That was the big problem that the way it was there was only head height at the door, now it is 10.5degs up from there.

 

[Ashley Burton]

Now it is re-built from the inside I can re do the front when funds and weather allow.

Yep lots of roof height - That was the big problem that the way it was there was only head height at the door, now it is 10.5degs up from there.

I bet your a happy chappy! Change for the better I would say

 

[gaz1]

So I tore it down and put it up in one Friday (ok from 9am to midnight!). I prebuilt the rear wall in 2 sections inside the shed then just lifted them into position on the day. The front wall had to be heavily reinforced as it was very flimsy even before I took the old joists down - basically all the weight is now on new structure - you can see the front reinforcements on the right here, the OSB on the floor is the back walls.

ive done same with my shed twice thanks to a complaining neighbour

http://www.mig-welding.co.uk/forum/threads/shed-roof-change.57025/

those days are long when you need to get things done fast i was lucky did one once on longest day the other well lasted to 11pm same start as yours

and im still not finished it yet im making him wait as a little bit of an eyesore as hes selling his property after 2 years owning it