Ermats New Shed.

**Ermat** · 18th June 2023, 07:56 PM

Originally Posted by Midnight Man

Only reason I asked that question was because when we bought the place we're in now, the shed out back (10m x 7m) had sarking on the roof, but not the walls.

The previous owner had bolted plywood to the purlins as you're doing. I wanted to investigate, because I was suspicious that they had not planned for condensation and allowed a way for it to naturally vent.

The amount of black mold behind the plywood when I pulled it off the walls was scary.

I ended up gutting the inside of the shed, and re-doing it: Midnight's Shed

2 factors prompted me to not install membrane.
1st being Zero condensation on inside of wall cladding, irrespective of weather, or season.
Secondly the exterior steel cladding is not flat but a folded profile to an offset of 10mm every 100 mm. Where the sheet is attached to the horizantal gert the profile on the cladding allows air movement between the gert and the cladding. The top and bottom gerts are not at the ends of the cladding, I stopped my ply on the upper and lower edges of the corresponding gerts .This allows for circulation between the ply and the cladding inside the building. The cavity is not a sealed space.
There is a vermin strip under the cladding which sits under the bottom of the sheet which finishes outside the building, 50mm under shed floor height.

**Tonyz** · 18th June 2023, 08:49 PM

just for my nosey curiosity what city or area are you

**Camelot** · 18th June 2023, 09:09 PM

It sounds like your tin external cladding gives plenty of airflow, but cladding the inside with plywood could cause Cold Bridging here's a link to what I am refereeing to https://www.google.com/search?q=cold...hrome&ie=UTF-8

**Ermat** · 18th June 2023, 10:25 PM

Originally Posted by tonyz

just for my nosey curiosity what city or area are you :d

bop

**Ermat** · 19th June 2023, 05:06 AM

Originally Posted by Camelot

It sounds like your tin external cladding gives plenty of airflow, but cladding the inside with plywood could cause Cold Bridging here's a link to what I am refereeing to https://www.google.com/search?q=cold...hrome&ie=UTF-8

Thanks Camelot. That make a lot of sense.
The way I see it I have 2 options. Take off the 10 sheets I have installed and install a barrier between the gerts and the ply. That may not be perfect but probably better than option 2 which is to leave it and hope for the best.

**mature one** · 19th June 2023, 08:39 AM

Just done up a man cave and the condensation was dripping from the roof like you wouldn't believe [goulburn valley area]allow for condensation if you are able its a nightmare if you don't .

**Ermat** · 11th July 2023, 05:54 AM

Well that was a P I T A . Removed all sheets, Applied a building paper and reinstalled.
Now onto my original point of this thread and that is to install the french cleats to the ply.
As my ply is only secured to 3 horizontal gerts (no wood studs, only a few vertical steel studs) the plan is to go light on the amount of cleats to not overload the wall. I figure some cleat storage is better than none.
Anyway, we are moving forward.

**Midnight Man** · 11th July 2023, 01:33 PM

Originally Posted by Ermat

As my ply is only secured to 3 horizontal gerts (no wood studs, only a few vertical steel studs) the plan is to go light on the amount of cleats to not overload the wall. I figure some cleat storage is better than none.
Anyway, we are moving forward.

I am no engineer! But, to my thinking, if your plywood sheets are installed flush to the concrete floor, I would imagine most of the vertical load will transfer down the sheet, and be borne by the floor itself (i.e., nothing to be concerned at).

You will have some horizontal load, as items are effectively hanging off the front of the sheet, but this should be relatively minor - unless you go mounting some super heavy stuff

**Mountain Ash** · 13th July 2023, 08:58 AM

Hi MM. Yes up to a point. If the panels are plumb then all load is on the concrete, but as things are loaded onto one side of the plywood the load shifts and the stress on the fixings into the girts increases.

**Ermat** · 14th July 2023, 10:23 AM

Originally Posted by Midnight Man

I am no engineer! But, to my thinking, if your plywood sheets are installed flush to the concrete floor, I would imagine most of the vertical load will transfer down the sheet, and be borne by the floor itself (i.e., nothing to be concerned at).

You will have some horizontal load, as items are effectively hanging off the front of the sheet, but this should be relatively minor - unless you go mounting some super heavy stuff

I did not install the sheets flush with the floor as i did not want to risk drawing moisture from the floor. The sheet stops at the bottom gert so all loading is on the 3 gerts.

**ErrolFlynn** · 14th July 2023, 10:57 AM

Providing the things you hang from it are relatively light (ie. you can pick up with one hand like chisels, saws, screwdrivers) I doubt there would be any problem. Heavy items like chainsaw, welder, and materials like timber or steel lengths would be best on storage shelves that rest entirely on the floor. Consider how large your peg board needs to be. Perhaps if located above a (freestanding) bench would be a useful spot. In which case a supporting structure attached to the bench would do the trick.

**Ermat** · 19th July 2023, 06:10 AM

Originally Posted by ErrolFlynn

Providing the things you hang from it are relatively light (ie. you can pick up with one hand like chisels, saws, screwdrivers) I doubt there would be any problem. Heavy items like chainsaw, welder, and materials like timber or steel lengths would be best on storage shelves that rest entirely on the floor. Consider how large your peg board needs to be. Perhaps if located above a (freestanding) bench would be a useful spot. In which case a supporting structure attached to the bench would do the trick.

Yes thats what I'm thinking, keep the load light.

Thread: Ermats New Shed.

Thread Tools

Search Thread

Cold Bridging

Similar Threads

shed tank stand footings questions - tie to shed slab?

Shed House & Shed inventory For Insurance Purposes

I do do something in the shed other than make a mess and drink beer in my shed

Posting Permissions