Another boring shed query – Treated / Untreated

sorry, but I know we all like a shed question?;)
Building Shed-1 with 3×2, I know I should go with treated timber but its always wet & bent 🙂 so dont like! Am I ok to use untreated CLS?
I will cover outside with OSB, Waterproof breathable membrane (like Tyvek) then lap boards? So should be pretty blooming water tight?? U reckon untreated be OK, or is that silly for few extra pence of treated? Ta

I always use treated.

Treated, collect it and pick out the good ones.

For that construction I’d be fine with untreated. Just detail the bottom properly.

The only time I’ve bought treated is fence posts. Even built wood stores untreated and treated myself afterwards. For the inside of a shed is pointless. Look at the shed videos on youtube, the studs are never treated.

Brill 50/50 so far, thanks

Will you accept the inside of your shed being wet? I’d suggest probably not so therefore untreated is perfectly ok. As above tho make sure you take time getting the sole plate up out of the moisture.

wrighty, is there anywhere good online to show methods for this? also interested..

I’ve not seen any. A pretty simple way would be to firstly create your shed base separately, the sheds that you get from say b and q always seem to rot at the floor/wall interface.
I’d always use tanalised for the base timbers and try and keep them out of standing water, I tend to use either concrete blocks or concrete pads to land them on, I then use a small piece of simple dpc where the two meet. Silicone seal your ply deck down on to the tanalised timber. Once your base is up and out of the moisture Id run a good silicone bead again at floor/wall interface then fix accordingly. When you then come to clad I again make sure the exterior skin laps down past the floor/wall joint to again protect the ends of the bearers from driving rain and to also make it look neater. Only downside with this method is you end up with a step in to the shed but it keeps it nicely elevated off the ground.

ok thanks! thats the kind of thing i was planning to do. a step doesnt bother me.

Tanalised rough sawn timber for the base – treated CLS for the walls/roof – treated cladding for sides. For the roof use OSB but paint the edges before fitting and cover with good quality felt.

Just a thought the base is made up of old scaffold boards which are not treated, and I guess thats the weak area? But well raised on “cemented in” old concrete fence posts. So if thats not treated and I protect that area OK, sure rest will be fine.

Most definitely treat the outside edge of the osb and the ends of the scaff boards with something. They’re just begging to suck moisture in. When you wrap your walls allow some to drape down over that exposed edge also. One question I would have is how are you going to clad down past those as you’ve nothing to fix to?

It may be worth considering if you intend to paint the wood?

Treated is harder to paint as it doesn’t absorb

One question I would have is how are you going to clad down past those as you’ve nothing to fix to?

Wrighty, the stud work will be flush to front of OSB & scaffold boards. Then Tyvek (Can come lower like skirt) Then OSB on outside hanging down. That overhang is only about 6 inches. Not touching ground. Then Lap ontop of that?

Jeez you’re going all out by putting a layer of osb on to your studs. Just assumed you were cladding on direct. Absolutely no need for treated timber as the osb will rot first.

You seem to be building a shed designed to last for eternity on a base designed to last a few years. Personally I’d of started with a concrete base and a dwarf wall. And to answer the question of the stud work I’d not worry about it being pre treated as it’s going to be very well protected.

Untreated studs = fine.
Is there good airflow around your scaffold boards? i.e. are the fence posts only in one direction with open ends?

What’s under that? Hardcore, or soil?

Jeez you’re going all out by putting a layer of osb on to your studs.

nothing like a bit of over-engineering ? 🙂

Is there good airflow around your scaffold boards?

Alex See pic, I think there is? Open at ends. The posts are cemented down. The rubble crap is actually old paving I needed to get rid of from front garden! Its gappy and sits below scaffold floor bit? Hopefully oK?

so im kind of doing a similar one to the OP.. the base isnt the same but the walls seem to be similar. How does one stop the OSB on the wall (with ends on the bottom) from absorbing moisture? i’d planned to have my structure, then ply then dpm then breather battens and larch.

Is the damp proof strip I can see on your first photo over just the concrete, or over the whole floor area?
Is it just soil under the rubble?

You can get end grain wood preserver, meant for treating cut ends of pressure treated wood. Or you could bitumen the osb edges

Jonno this is mine so far. I have the Cedar ready to go but reluctant to ruin my lawn working on it…

[/url]20170809_210232 by mcivord[/url], on Flickr[/img]

[/url]20171029_161225 by mcivord[/url], on Flickr[/img]

Is the damp proof strip

Alex yes DPC just wider than old concrete posts. So wood is just resting on plastic.
There was lot of old paving slabs from some previous structure (before my time) so cemented ontop of this, not soil.

Jonno this is mine so far

Surfer been following your thread, looks great. Well done.

ONly fing went and did this with skill saw!@££%^ School boy error? Think ill just get away with it as near support. 🙂

Easily done. I set my blade a few mm too deep when I was cutting up some floorboards a couple of years ago and cut through a heating pipe that was pressed upwards against them….. How we laughed!!!

Looks like a great project Jonno101, 3D models and everything!

Looking at the photos, the only thing I’d suggest is investing in a spirit level – everything looks a little wonky to me?

Hi Jonno101, first post here, but am a keen shed builder myself.

Your plans look good and like the cutaway sketchup plans.

Following on from previous post… I agree – best way to make sure it’s weather tight is to make sure the base is level… as currently looks on the piss? PM me and i can lend you a large spirit level.

@Surfer

What roof do you have on that shed you’ve built? Looks like a properly finished rubber jobbie?