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Pete's Workshop Build

Roll up, roll up. Here you will find everything from new workshop designs, through builds to completed workshop tours. All magnificently overseen by our own Mike G and his tremendously thorough 'Shed' design and generous advice.

Re: Pete's Workshop Build

Postby Peteh » 01 Aug 2020, 09:39

A busy few days during which time the concrete has more or less dried out after last weeks downpours which turned the base into a paddling pool.

The thermalite blocks seem to take the longest to dry out and whilst removing some internal OSB sheathing I noitice the wood was damp on the block-facing edge. Appreciate this wood is fairly water replusing but decided to slip a 300mm vertical section of Damp Proof course vertically between sheathing and the blocks around the circumference of the structure.

Since I didn't want major water problems again, with the help of the good lady we pretty much wrapped the building in membrane yesterday and will unpin it to put the insulation in place and to finish it off properly.

Save for the gable ends and extra membrane at the roof edges, this is looking much more water tight.


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The fold at the bottom of the membrane is a temporary feature whilst we work out the hospital corners on the DPC, it allows us to get the square shape.
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Re: Pete's Workshop Build

Postby 9fingers » 01 Aug 2020, 09:44

Coming on nicely Pete!

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Re: Pete's Workshop Build

Postby Malc2098 » 01 Aug 2020, 10:03

9fingers wrote:Coming on nicely Pete!

Bob


:text-+1:
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Re: Pete's Workshop Build

Postby Andyp » 01 Aug 2020, 10:30

Indeed,
Nice greenhouse too.
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cheers
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Re: Pete's Workshop Build

Postby Peteh » 03 Aug 2020, 07:44

I have a question on insulation for the roof.

I note on Mike's shed build he used Glass fibre and filled the whole 6 inch cavity without an air gap, also sealing the eaves with the wooden contraptions.

Yet on Malc's build he was very careful to leave a 50mm air gap.

Anyone care to speculate why the difference or otherwise?

And any advice for me? I'm looking at a metal coated tile like sheeting (similar to what Malc used) which will sit on battens on top of breather membrane.

I may of course have now answered my own question in that perhaps the battens provide the required air gap...
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Re: Pete's Workshop Build

Postby Malc2098 » 03 Aug 2020, 09:15

Peter,

If I've understood all the technical stuff I had to learn, the metal roof will get hot and cold at various times, so whatever is underneath it will have some air and so some moisture in it. So that air needs to ventilate. If it doesn't, any moisture will stay on the timber and precipitate its rotting.

The insulation underneath will also have an effect on any air above it.

If I recall on mine, the insulation stopped 25 mm (ish) below the top of the rafters, and I put a 25 mm roofing batten across the rafters creating a 50mm gap.

I also ensured that the air could travel up and over the ridge and also along the roof from one end to the other.

Hope that helps.
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Re: Pete's Workshop Build

Postby Peteh » 16 Aug 2020, 20:41

I have a question on cladding. The wood has arrived and I'm wondering if there's a right and wrong way round to fix it to the battens.

The featheredge profile is basically a right angled triangle and does it matter whether the right angle goes on the batten or away from the batten.

Does it need to be consistent?
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Re: Pete's Workshop Build

Postby Mike G » 16 Aug 2020, 20:48

Either way will do, but don't mix it up, because it shows. A bit.
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Re: Pete's Workshop Build

Postby Peteh » 19 Aug 2020, 10:32

Progress has been slower with the inclement weather but the insulation is all in place.

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And the bulk of the roofing has been done. I used Britmet Ecopan plus which they say is either an aluzinc (??) or galvanised 0.9mm sheet covered in a textured acrylic material and formed to be lightweight and to have the appearance of tiles.

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Re: Pete's Workshop Build

Postby Malc2098 » 19 Aug 2020, 10:43

Coming along nicely!
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Re: Pete's Workshop Build

Postby Peteh » 19 Aug 2020, 10:45

And last night disaster struck in the form of the storm.

The floor is flooded and I don't know how.

I have a theory.

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I put some of the battens on yesterday and the breather membrane no longer overlaps the entire brickwork.

I think the holes in the brick have filled with water which has found its way into the inside. It's only a theory but the best I can come up with...

What do I do? I have a number of options:

- Nothing because the routed edge of the bottom featheredge board will cover the brick
- Fill-in the "holes" in the brick with mortar and SBR which will make it waterproof
- Extend the breather membrane with some more breather membrane or DPC

A more elaborate extension of the third option would be to form the DPC under the breather membrane and then use silicone to stick it on the top outer edge of the bricks providing a proper seal.

This is a horrible setback, particularly since the weather isn't great.

The Thermalite blocks will hold water like a sponge. Fortunately I put some DPC between the blocks and the OSB inner lining.
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Re: Pete's Workshop Build

Postby Peteh » 19 Aug 2020, 10:45

Malc2098 wrote:Coming along nicely!


Hmm. You replied too promptly!!!!!
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Re: Pete's Workshop Build

Postby Malc2098 » 19 Aug 2020, 13:33

Maybe.

I thought the breather membrane had to overlap the folded back DPC.

I got mine wrong to start with.

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Then was advised by more experienced members to overlap the DPC.

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Which allowed the battens to be almost as proud as the DPC wrapped around the arris rail along with the wedges will then let the cladding, particularly the bottom board, to overlap the brick plinth, as well as provide somewhere to staple the insect mesh.

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But I think you should definitely find the source of the ingress and real with it, if it isn't the membrane.
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Re: Pete's Workshop Build

Postby RogerS » 19 Aug 2020, 14:34

I hope you get your leak sorted. Fingers crossed re your roofing decision. The house we bought has a log store - admittedly built in 1980 or so. It has metal sheets that look like tiles. And leak like a sieve.
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Re: Pete's Workshop Build

Postby Peteh » 19 Aug 2020, 19:39

The building is well covered in breather membrane and the leak is definitely not from the roof. Whether the tiles will perform over time remains to be seen.

The leak is definitely around floor level so I extended the membrane with DPC so there is no water run-off into the hollow cavaties of the brick.

De-humidifier is on max!!!!!
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Re: Pete's Workshop Build

Postby Malc2098 » 19 Aug 2020, 21:25

If there's standing water, can you syphon it?
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Re: Pete's Workshop Build

Postby Peteh » 19 Aug 2020, 21:30

Used a mop and now the dehumidifier to dry it all out.im certain the issue is water pooling in the brick cavities but time will tell.

The inclement weather really takes its toll.
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Re: Pete's Workshop Build

Postby Mike G » 20 Aug 2020, 07:02

My small store shed leaked before I boarded it, and I discovered that the source of the problem was water running under the DPC. I waited until it was dry and ran a bead of low-modulous silicon around the outside between the DPC and the brick it was sitting on. That solved the issue.

I'd not bother with a de-humidifier. Just throw doors and windows open.
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Re: Pete's Workshop Build

Postby Peteh » 03 Sep 2020, 21:29

The water ingress was definitely happening either under the DPC (most likely) or through the brick cavities. An extra layer of DPC under the membrane and overlapping the brickwork has cured the issue.

Cladding is underway although a bit back to front. We did the gable ends first in order to finish off the roof detail with the scaffold tower on site.

As well as the cladding have started the roof insulation (100mm Xtratherm) and just finished the windows and door.

The cladding really eats up the Bedec barn paint. First three 5l tons gone and another 5 on order. Not cheap at 60 quid a pop.

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Re: Pete's Workshop Build

Postby Malc2098 » 03 Sep 2020, 22:03

Starting to look nice.
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Re: Pete's Workshop Build

Postby TrimTheKing » 03 Sep 2020, 22:14

Looks good. Aren’t you supposed to water down the first coat, which would make the paint go further?
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Re: Pete's Workshop Build

Postby Peteh » 03 Sep 2020, 22:19

TrimTheKing wrote:Looks good. Aren’t you supposed to water down the first coat, which would make the paint go further?


Yes I added 30 to 40 percent water for the first coat
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Re: Pete's Workshop Build

Postby Peteh » 03 Sep 2020, 22:21

Malc2098 wrote:Starting to look nice.


Thanks. It is coming along well but as you well know, a big old project!
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Re: Pete's Workshop Build

Postby TrimTheKing » 04 Sep 2020, 00:14

Peteh wrote:
TrimTheKing wrote:Looks good. Aren’t you supposed to water down the first coat, which would make the paint go further?


Yes I added 30 to 40 percent water for the first coat


Wow!
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Re: Pete's Workshop Build

Postby Mike G » 04 Sep 2020, 07:41

TrimTheKing wrote:
Peteh wrote:
TrimTheKing wrote:Looks good. Aren’t you supposed to water down the first coat, which would make the paint go further?


Yes I added 30 to 40 percent water for the first coat


Wow!


Yep, but it's right. I've used thinner than that. The first coat really penetrates the surface of the wood, sealing it up so that the subsequent coats aren't soaked up so readily.
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