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Not Quite Shed Build, more finishing

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Not Quite Shed Build, more finishing

Postby Dave1w » 12 Sep 2017, 17:45

OK, here goes. This is not so much a build a shed post, rather, I have gone for a shed built for me, which I will then be finishing off to my taste, hopefully with idea of the shed lasting 20 or so years. Once this one is done, hopefully I will have learned enough to build a second, smaller shed for my wife ( well that's what I have told her anyway).

We spent the last 12 years overseas, and have now come back to the UK with the idea of settling down. Building some sort of shed / workshop / man cave has been an idea of mine for a long time, so now we found a nice place to live with a bit of space, I was allowed to start thinking about it.

We live in a conservation area, so planning permission for any building was required, although in this case, it was free of charge, but took 6 weeks or so.

I put in plans for 2 sheds, one 17 x 8 and one 10 x 8, by which time (at the time of putting in the plans) we'd have enough work / play space for both of us and the garden.

As I mentioned before, the idea is to have the first one built for me, and to go about building the smaller one myself.

I went with a company off the internet to have an 18 x 8 workshop type thing built, but by the time I specced it all up as I wanted it, it came out at quite a lot of money, so scaling back a bit and committing to doing the finishing touches myself, we came to an acceptable price and spec for me to go from.

The slab where it is going was relatively tidy after removing the old rotten shed and green house, and cleaning it off.

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I wanted to get a space down the back to be able to repaint it every now and then, but the slab isn't wide enough so I came up with the thought of using concrete fence posts as a base to handle the 6 inches or so of overlap and to also lift it wood the concrete where I think it would suffer from water running down the Bank. Fingers crossed this solution will work, with enough posts the shed floor should be pretty well supported. It could be higher from the floor I suppose, but I think it is at least 4 inches. Anyway that's what I did....

Delivery day came, and the shed went up pretty quickly, fitted in place and finished off with a heavy duty felt roof. All in all it took 3 lads about 3 1/2 hours to get it all up and finished.

Image

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Pretty basic "Heavy Duty" shed, the only real extra I went for was to have joinery doors fitted so I can hopefully secure the shed better, and security windows down the back (although not really sure why I did that as it is going to be more hassle when lining it). Lining with breathable membrane, insulation, and fitting an onduline roof all really pushed up the price, so I decided that I was going to tackle those bits myself.

While it comes tanalised from the supplier, hopefully to supplement this, I applied no-nonsense wood preserver treatment from screwfix to the inside of the shed. And proceeded with a bit of help later on from my wife to put on two coats of Cuprinol paint to the exterior. We'll see how well that lasts, but after the second coat, I was pretty happy with the new colour of the shed.

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I managed to do this in a day when I saw that were forecast for a week of rain to follow, but which never came.... after that, the next step was to put on the corrugated bitumin roof that I wanted ( and also told the planning people I would have).

Between me being really bad with heights and not wanting to crush my new shed, I managed to persuade my wife to get up on the roof with a hammer and do all the nailing in place. We decided to use treated battens, as the roof is about 19mm tongue and groove and wanted the nails to get a good purchase.

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So onduline (actually the slightly cheaper coroline) and felt, hopefully the roof will be pretty sturdy and watertight.

Image.

We still have to fold down the sheet on the verge and tidy up the end of the ridge, as well as finish a few last nails, but we got it all in place just as the heavens opened. I was keen to get it all done while the felt was dry and make sure the battens didn't get wet, although there is decent enough ventilation.

At the same time, we are just starting an extension to the house, so any major work will be in drips and drabs, but we should be hopefully able to benefit from cheaper materials for lining it all out.

So, so far, an almost off the shelf, just a few small compromise, but hopefully nothing that's going to have it rot out in 3 or 4 years. On the outside, we still need to finish the verges, add guttering, (does anyone know if the mini stuff for sheds is any good?), and also, giving some thought to some protection from splashing at the base of the walls - right now thinking pebbles or something.

The eaves under the original roof are wide open, but that is going to be addressed in the next bit on doing the inside. I'm actually surprised that a master procrastinator like myself has managed to get it painted and almost roofed within 5 days of it going up!

Dave





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Last edited by Dave1w on 07 Oct 2017, 08:23, edited 1 time in total.
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Re: Not Quite Shed Build, more finishing

Postby 9fingers » 12 Sep 2017, 17:56

Excellent progress and great idea to get swmbo involved too.
Looking great now!

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Re: Not Quite Shed Build, more finishing

Postby Rod » 12 Sep 2017, 18:04

Looks good

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Re: Not Quite Shed Build, more finishing

Postby Andyp » 12 Sep 2017, 18:08

Well done. I'd go for full size guttering if I were you. With all those trees around the small shed stuff will get clogged in no time.
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Re: Not Quite Shed Build, more finishing

Postby Malc2098 » 12 Sep 2017, 19:07

Well done and looking good.
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Re: Not Quite Shed Build, more finishing

Postby Dave1w » 13 Sep 2017, 12:18

Thanks guys!

Next step is to get in with the inside lining and insulation. I'll actually be doing the roof first - battens to give me a 50mm (or maybe 40mm) gap, fully ventilated save some insect mesh at the eaves, breathable membrane then either 25,30,40 or 50mm celotex. But some bits are ready just about fir the walls.

I just got these through the post

Image So I am planning to stick one at the top of each section, then inch batten, 40mm celotex then lined with ply or OSB.

IMG_6813.JPG
(193.05 KiB)


Going to sit down and have a serious think about how much insulation I need to order now, and would appreciate any thoughts on what thickness I suitable for walls and roof to be comfortable

Dave


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Re: Not Quite Shed Build, more finishing

Postby Malc2098 » 13 Sep 2017, 13:26

Hi Dave, Looking good.

Being a DIYer, as opposed to knowing what I'm doing, I'd just fill the depth of the framework on your walls and ceiling/roof, so you only have to cover with ply/OSB and fix onto the existing framework, keeping the job easy. I'd use 11mm OSB.

Which insulation to get, I'd leave that up to those who know what they're doing.

HTH.
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Re: Not Quite Shed Build, more finishing

Postby greeno » 13 Sep 2017, 14:56

I'd ask MikeG. You might end up with interstitial moisture issues issues between the insulation and inside face of the cladding.
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Re: Not Quite Shed Build, more finishing

Postby TrimTheKing » 13 Sep 2017, 15:06

You need to leave a gap between the outside face of the insulation and the inside face of the cladding, and between each internal stud needs venting top to bottom (which I think you already have covered with those round vents.

The answer to your question how much insulation, well either go with whatever the closest size is to fit flush with the inside face of the while still leaving an inch or so gap ORRRRRRR go for thicker, still leaving a gap, but accept that you might need to pack out the studs before putting your internal surface on, and how much internal space will that lose you.

Hope that helps

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Re: Not Quite Shed Build, more finishing

Postby Dave1w » 13 Sep 2017, 15:36

Thanks,
I've started putting in the inch battens in the walls, which should give me an ok air gap, and there'll be just enough room for 40mm , (maybe 39mm....) I'm loath to lose any more internal space.

Roof is les of an issue, can just put the celotex over rather than between so can have a good air gap and still headroom.

I also need to give some thought to how I will run conduit for the sockets and the lights.


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Re: Not Quite Shed Build, more finishing

Postby TrimTheKing » 13 Sep 2017, 15:50

Dave1w wrote:Thanks,
I've started putting in the inch battens in the walls, which should give me an ok air gap, and there'll be just enough room for 40mm , (maybe 39mm....) I'm loath to lose any more internal space.


I don't get this, battens in the walls? Where are they going? And what for?

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Re: Not Quite Shed Build, more finishing

Postby 9fingers » 13 Sep 2017, 15:59

TrimTheKing wrote:
Dave1w wrote:Thanks,
I've started putting in the inch battens in the walls, which should give me an ok air gap, and there'll be just enough room for 40mm , (maybe 39mm....) I'm loath to lose any more internal space.


I don't get this, battens in the walls? Where are they going? And what for?

Cheers
Mark

Presumably to space off the insulation from the outside timber cladding?
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Re: Not Quite Shed Build, more finishing

Postby TrimTheKing » 13 Sep 2017, 16:05

9fingers wrote:
TrimTheKing wrote:
Dave1w wrote:Thanks,
I've started putting in the inch battens in the walls, which should give me an ok air gap, and there'll be just enough room for 40mm , (maybe 39mm....) I'm loath to lose any more internal space.


I don't get this, battens in the walls? Where are they going? And what for?

Cheers
Mark

Presumably to space off the insulation from the outside timber cladding?
Bob


Hmmmm, so long as they are vertical otherwise they will stop the airflow...

I wouldn't bother with battens, a couple of panel pins knocked in at an angle, top and bottom, an inch from the cladding will be enough to press the insulation into to hold it in place until cladded over...

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Re: Not Quite Shed Build, more finishing

Postby 9fingers » 13 Sep 2017, 16:17

Agreed. That is how I would do it too
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Re: Not Quite Shed Build, more finishing

Postby Andyp » 13 Sep 2017, 17:15

How do you feel about surface mounting your electrics? Not to everyone's taste I know but gives you flexibility if you do not get everything in the right place first time or if you wish to re-jig the layout later.
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Re: Not Quite Shed Build, more finishing

Postby Dave1w » 13 Sep 2017, 20:22

Yes, to hold the insulation back, and what I was going to staple the breathable membrane to. On the electrics, while a lot easier I'd prefer not to surface mount, but will have a good think about it.


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Re: Not Quite Shed Build, more finishing

Postby 9fingers » 13 Sep 2017, 20:36

Dave1w wrote:Yes, to hold the insulation back, and what I was going to staple the breathable membrane to. On the electrics, while a lot easier I'd prefer not to surface mount, but will have a good think about it.


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Concealed electrics will take a bit of planning and care that if you fit noggins to screw the back box to that you don't shut off the ventilation path.
Maybe use drywall boxes let into your osb inner skin with the insulation recessed out to fit each box.
It always seems to be a pita adapting factory built sheds but I understand why you took that approach.
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Re: Not Quite Shed Build, more finishing

Postby Mike G » 13 Sep 2017, 20:50

Dave1w wrote:.... and what I was going to staple the breathable membrane to..........


Unless you are using the breather membrane to physically hold the insulation up, then there is no point fitting it. I really would save yourself the time and trouble.
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Re: Not Quite Shed Build, more finishing

Postby Dave1w » 14 Sep 2017, 00:18

That would save a bit if hassle. Does anyone have any thoughts on thickness of insulation ? I'm pretty much settled in celotex and can get OK prices, I'm just wondering on the benefits if 25,30 or 40mm


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Re: Not Quite Shed Build, more finishing

Postby Mike G » 14 Sep 2017, 07:15

Celotex is approximately twice as good an insulator as mineral wool (fibreglass), so 50mm is equivalent to 100mm of mineral wool. 100mm of mineral wool is about the minimum useful amount in my experience, so I suggest you try to fit at least 50mm of Celotex into your walls. The more you put in, the more grateful you'll be in January and February.
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Re: Not Quite Shed Build, more finishing

Postby 9fingers » 14 Sep 2017, 07:56

There is no doubt that more insulation will be better but don't forget that if the building is not airtight even a modest airflow/draught will undo much the benefits of insulation.
Also if you are only heating sporadically, you might not benefit that much from extra insulation.
Sometimes overlooked, insulation only slows down the rate of heat transfer. It does not stop it happening.

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Re: Not Quite Shed Build, more finishing

Postby Dave1w » 14 Sep 2017, 08:03

Yes, going to be keenly sealing the whole thing on the inside. Then a small tube heater or the like and a bigger one to top it up when I'm in there.


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Re: Not Quite Shed Build, more finishing

Postby Dave1w » 28 Sep 2017, 21:47

Been very busy with work, a trip to Finland and our extension starting, but finally this evening it some time to make a start on the inside.

Image

The builder has a good account with the local MKM so got me a half decent price for some PIR and they dropped off 12 sheets this morning. It’s going steady away and I’ll probably call it a night when I get this last panel put in - probably a good idea as I disappeared straight after tea and didn’t help out with bath and bed time for the kids .....

Settled on 50mm for the walls and roof, with inch battens in the walls and little soffit vents at the top. I just want to treat / paint the holes where they are bare wood before popping the little vents in. Once it’s all done, a bit of expanding foam and tape then it will be ready for lining.



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Re: Not Quite Shed Build, more finishing

Postby TrimTheKing » 28 Sep 2017, 22:42

:eusa-clap:
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Re: Not Quite Shed Build, more finishing

Postby Malc2098 » 29 Sep 2017, 11:01

Coming along nicely!
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