Re-felting shed roof

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TELLIT01

Albermarle said:

chrisw said:

grumpy_codger said:

Yes, you need adhesive - everywhere, not only for overlaps. 

If you lay it along the ridge/sides, you do sides first, then the ridge so that it overlays on the top. I think this is obvious.

I've done several shed roofs over the years and I've never used any adhesive. I would think it makes it messy next time it's replaced.

Never used it myself, but many people recommend using rubber EPDM membrane instead of felt for longevity.

EPDM is often used instead of felt on flat roofs for buildings, where the performance requirement is much higher than for a shed.
In this case laying an EPDM roof is said to be an easier/more DIY  job than a Torch On Felt roof, depending on the roof layout. 
Maybe EPDM is also used for sheds, but not normally AFAIAW.

EPDM is definitely used on sheds.  The guy who did it for me has it on two of his sheds and the people next door but one to me put it on 2 large sheds during the Summer.  It's obviously more expensive investment than felt but will only be done once.  The roofs I'm referring to are all pitched roofs.

Niv

I used EDPM on my shed approx 8 years ago. Looks like I put it on yesterday. I cant recommend it enough.

QrizB

Niv said:

I used EDPM on my shed approx 8 years ago. Looks like I put it on yesterday. I cant recommend it enough.

After refelting my shed twice, I went for EPDM too.

I reckon it'll outlast the rest of the shed. Would recommend it. It's not all that expensive either!

B0bbyEwing

Was having a look at EPDM last night & just noticed a few things.

Every application I saw had a roof on OSB sheeting, so it's a complete sheet to roll your adhesive on.
Mine isn't that - it's slats. I'm going to assume it's the same timber that's used for the rest of the shed so I'm going to say 4x1. 
Actually, dealing with this stuff daily it doesn't look like 1inch thick (I haven't paid THAT much attention, I'd need to measure to be sure). It's most certainly not 2inch thick but I'd say it's possibly more 1.5inch, but anyway from the inside looking up at least - the roof is slats, so it be ok laying adhesive on this or does it need to be sheeting?

And one of the downsides I Googled about EPMD was it not being so puncture proof. Depends what's required to puncture it I suppose but like I said, cats love to jump up on to our shed roof. So when Google says it's not so puncture proof are we talking heavy duty like nails (I'd expect those to go through obviously) or are we talking minor things like cats claws will damage it?

QrizB

B0bbyEwing said:

 the roof is slats, so it be ok laying adhesive on this or does it need to be sheeting?

My shed roof is planked, not OSB. EPDM went on fine. I think it's been on there for four years now.

B0bbyEwing said:

 So when Google says it's not so puncture proof are we talking heavy duty like nails (I'd expect those to go through obviously) or are we talking minor things like cats claws will damage it?

It's much tougher than felt is.

If the cats are smaller than leopards, it should be fine.

Lorian

I put EDPM on my shed too some years ago. It also has T&G for the roof . I briefly considered over boarding first but did not.

You see the T&G slightly through the rubber but it looks fine and is glued down well. I rolled on the water based glue and used the contact adhesive around the edges.

I'd never use felt again, having replaced the felt about every 10 years previously, I expect the rubber will outlast me.

You need a very dry day to do the job. The roof needs to be very clean of old grit, nails and staples, and you need to let the rubber rest on the roof ideally in the sun before gluing it. Plenty of YouTube videos in how to do it and some of them are right ;-)

B0bbyEwing

Lorian said:

I put EDPM on my shed too some years ago. It also has T&G for the roof . I briefly considered over boarding first but did not.

You see the T&G slightly through the rubber but it looks fine and is glued down well. I rolled on the water based glue and used the contact adhesive around the edges.

I'd never use felt again, having replaced the felt about every 10 years previously, I expect the rubber will outlast me.

You need a very dry day to do the job. The roof needs to be very clean of old grit, nails and staples, and you need to let the rubber rest on the roof ideally in the sun before gluing it. Plenty of YouTube videos in how to do it and some of them are right ;-)

Ahh thanks for that.

That last bit could be a deal breaker then. I should've done this in the summer but didn't get round to it. Under heavy rain the shed now leaks so all the shelving ends up totally wet and anything on there too so it has to get done in a few weeks when I'm off work. 

Which at this time of year will probably mean felt then. 

TELLIT01

Get cheap felt to protect the roof over winter then EDPM next summer.

Belenus

B0bbyEwing said:

Lorian said:

I put EDPM on my shed too some years ago. It also has T&G for the roof . I briefly considered over boarding first but did not.

You see the T&G slightly through the rubber but it looks fine and is glued down well. I rolled on the water based glue and used the contact adhesive around the edges.

I'd never use felt again, having replaced the felt about every 10 years previously, I expect the rubber will outlast me.

You need a very dry day to do the job. The roof needs to be very clean of old grit, nails and staples, and you need to let the rubber rest on the roof ideally in the sun before gluing it. Plenty of YouTube videos in how to do it and some of them are right ;-)

Ahh thanks for that.

That last bit could be a deal breaker then. I should've done this in the summer but didn't get round to it. Under heavy rain the shed now leaks so all the shelving ends up totally wet and anything on there too so it has to get done in a few weeks when I'm off work. 

Which at this time of year will probably mean felt then. 

Here in West Sussex the weather forecast for the next ten days is mostly sunshine so, depending on where you live, you could probably find a suitably warm and sunny day to fit EPDM.

It is an easy job. My wife and I did a medium size apex roofed shed some years ago in a few hours.