roofing question shed build

[David_c]

Hi Folks,

My question is as i am using osb for the main bulk of the roof covering would it be ok to use some spare shiplap to do the overhanging bit of the roof ( the bits i will see from outside when its finished ) .
I am using plain old felt covering for the moment , tho i might try puttting felt shingles on if i win the lottery .

The shiplap is 2 or 3 mm thicker than my osb so i was thinking i might
get away with it with some fettling about or something ?

Could i rip it down ( not got P/t ) even tho its tanalised , does that matter ?

Any tips or help gratefully appreciated !!!

Dave

 

[MikeG.]

Dave,

if you have to felt, the key thing is to have a flat (co-planar) surface on which to lay it. Ripples and ridges will reduce the life of the felt by years.

Within those constraints, there is no problem in principal having boarding on the eaves overhang........indeed, it is quite a common detail. If it is thicker than the OSB, then I would pack the latter up until there is a smooth surface for the felt to sit on.

What pitch is your roof?

I would always advocate something other than felt for any roof. My shed has a roof of "Onduline" (or the un-branded equivalent). This is a pitch-impregnated corrugated fibreboard available in 4 colours.....and is cheap, easy and much longer-lived than felt. Ask at your local builder's merchants. I think it will go down to just a few degrees in pitch, but the steeper the better.

When you think of the value of the kit inside your shed, and how quickly water will wreck it, a few extra pounds on a decent roof seems like a good investment.

Mike

 

[OPJ]

Could i rip it down ( not got P/t ) even tho its tanalised , does that matter ?

There's nothing suggest you can't do this (use extraction, wear PPE, etc.) but you'll need to retreat any cuts you make in tanalised/pressure-treated timber as it only penetrates a maximum of 6mm all round the circumference in most softwoods.

 

[David_c]

Hi Mike ,

Many thanks for that . I may well do as you say and shim up the osb
a little then .
Slope is approx 15 degrees .

I think felt will just keep everyone happy , i'm trying to make it look
like a log cabin/summerhouse so appearance is important.

My original budget was about £400 to £600 :lol: , gone over just a tad , so i'm trying to save money now !!!

Hi Olly , Thanks , i wasnt sure it was good for the blade . I will likely
shim up the osb , simpler to do i reckon on balance.

Many thanks !!!

Dave

 

[David_c]

Hi ,

Getting hung up over what to go for , what is your roof made of , and
would you maybe choose different next time ?

Anyone used cheapo felt and been happy with it ?

Had any experience of katepal sbs shingles , they seem to
be good value compared to B&Q gear.

Any help gratefully received ...

Dave

 

[OPJ]

My understanding is that felt will barely last a few years. Mike has almost convinced me to go for Onduline, at some point. Shingles could work out quite expensive, especially if they're cedar.

 

[wizer]

never cheap on a roof, water is evil.

 

[Argyll]

I would always advocate something other than felt for any roof. My shed has a roof of "Onduline" (or the un-branded equivalent). Mike

So what is the Onduline equivalent and where can I get it from?

 

[Shultzy]

I've used Easy Seal from Wickes. They say it will last up to 20 years :wink:

 

[MikeG.]

Argyll,

one of the other brand names is "Bituwell", available through the Ridgeon's chain of Builder's Merchants in East Anglia. I am sure there are others too.

Mike

 

[David_c]

Hi , Thanks folks !

I copied the query over to a new thread , as i thought no-one would see
it here at the bottom ...dohh!

Olly, i'm only considering felt shingles , Katepal are a Finnish company
and they use sbs modified bitumen apparently its pretty durable , and good for 15 years .

Wizer , i agree , bit like foundations of sand sort of thing , no point going to all the trouble elsewhere in the build to later find it leaks after a year or two.
Shultzy , seen your build photos before now , gave me some inspiration you did ! That easy seal is the self adhesive stuff right ?
Comes out pretty dear , but i guess it'll last well eh. Tempting as
it will be easiest by far to cope with my odd roof shape.

 

[Shultzy]

Yes Dave the "EasySeal" is the self adhesive stuff. There are three parts, the primer is painted on, the underlay, and the capsheet. Very easy to apply using a roller. Only the returns are nailed with extra large galvanised clout nails.

 

[David_c]

Hi Shultzy,

That self adhesive stuff sounds like a dream to me .

I'm really tempted as it sounds sooo simple . ('')


ps - what do you mean by a roller , for the primer ?

 

[OLD]

I have used easyseal its very good not like felt but very strong, best on a mild dry day for primer drying and adhesion.
http://www.ruberoid.co.uk/pages/rub...8A-4498-B919-98FD01066AD1&CatID=41&ProdID=108

 

[JanneKi]

Olly, i'm only considering felt shingles , Katepal are a Finnish company
and they use sbs modified bitumen apparently its pretty durable , and good for 15 years .

It should definitely last at least that! It lasts that 15 years and way more even here in Finland, where it freezes upto -35 Celsius during the Winter. The UK winters I think are more forgiving...

The warranty is 15 years, in practice it will last much much longer.

 

[user 5027]

Yeah, the Easy Seal from Wickes is good stuff....

Use OSB 3 - which is slightly water resistant - not quite marine ply, but it does a good job.

I always overhand the roof all the way round and put a drip edge all the way round by rolling the easy seal up over some 6mm ply about 50mm deep.

Hard to describe and I can't find my pics of my last few sheds (yes last few). Even my girlfriend wanted a 'boys' shed !!

Paul.

 

[Shultzy]

ps - what do you mean by a roller , for the primer ?

You can use a roller for the primer but I used it to roll down the "Easy Seal" to get rid of the bubbles. It certainly is very easy to apply.

 

[David_c]

Hi , Thanks again for all the advice . I feel a conclusion coming on.

So Easy seal type seems best solution to me . Thanks Shultzy , Old
and Paul.

Janneki , Thanks i thought it was odd no-one had heard of
Katepal , but then you are in Finland!!! Underlay is a question
mark , seems only basic stuff available here in the wet , not so
very cold UK.

Std OSB is already on and a tarpaulin too !

Roller is a good tip , and drip strip too.

I have 22sqm to cover , add 10 % for wasteage ?
Odd shaped roof too :

http://picasaweb.google.com/iquiteliket ... 1466343074

Can i rely on joins across the width , or is that to be avoided.?
I mean will i end up with lots of silly sized offcuts i cant use .

Anyone seen any good deals on this stuff , should i just stick to
Wickes ?

Many thanks , Dave

 

[Shultzy]

Dave, download the pdf on "EasySeal" here

http://www.wickes.co.uk/pcat/65roofing

and you can make joins along the widths.

 

[David_c]

Hi Shultzy ,

Thanks again , i hadnt seen that leaflet , just the general one.
Very kind of you to post the link. I will give it a good look over.

Cheers , Dave