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So I'm thinking of cladding the interior of an outbuilding that will get pretty humid inside with some aluminium composite panels (following the STW wisdom in my earlier thread).
The uprights are every 75cm which I think is probably a bit far for the 3mm ACP to not be flapping around so I was wondering about a wooden panel support circa 9mm or 11mm thick and then glue the ACP to this. Should I use OSB or Marine Ply or neither?
For the outside I was going to use a PVC shiplap or similar and some kingspan or rockwool in the gap.
Will this work or will the OSB warp and the ply go mouldy such that the ACP falls off.. Heating the inside to prevent condensation isn't really an option.
whats causing it to be humid ?
Ive a shed build of OSB/Glasswool/OSB/breather Membrane and Box section roofing - no heating and no condensation issues here / mould issues.
Could you batten between the uprights and screw to that instead?
Yes I could put more battens in. Just thinking it might be easier to put a complete sheet to glue to.
what's the purpose of the aluminum composite cladding? interested as not heard of it. insulation?
I'm building a side return, I plan to use battons for cladding it's a lot lighter and easier to put up. and I'd imagine a lot cheaper. you would have to build the structure stronger to cope with the extra weight of all that sheet ply.
if its going to get really humid and wet I'd be having lots of ventilation. my side return is going tonbe for drying kit like wetsuits and paddleboards so it's going to have a section high up that is trellis for airflow
Are you planning on heating the outbuilding?
If not, why put insulation there other than to block the drafts? Insulation only does something is there is a temperature difference on either side of the wall. If there is no heating inside the building then both sides will be the same temperature. It might feel warmer inside because you are out of the wind but use a thermometer and if there is no heat source inside then they should be the same temp.
Well my rear gardens currently 5.4deg and my garage is 8.2dwg
Retained heat from when it was sunny 2 days ago
It stays cooler than outside in summer and stays warmer than outside in winter.
No heating but 100mm insulation all round except for the doors.
Hooded air bricks for ventilation in the blockwork
The aluminium panels were for aesthetics really.
Given the condensation I wanted something that is going to be easy to clean and also won’t degrade. So it could be pvc but that’s only gloss white.
it’ll be heated but still humid.
you can get compostie cladding that's coloured, it's about twice the price of the horrible white gloss pvc.
you haven't said what the outbuildings for. office? in which case ignore the stuff about a trellis.
however if its something like a hottub, then a section of compostie trellis high up might not be a bad idea.
don't see the point of insulating a garage unless you are going to be using it for long periods of time. if its just a store it doesn't need to be warm more important not to be wet
Stabilising temperature and moving dew point otherwise you'll end up with a damp interior/contents.
doesn't ventilation achieve a similar thing. we'll, I don't have damp issues with zero insulation
Good point DT yes tub of water inside so even though heating the room there’s still going to be plenty of moisture and will be part of year when not heating or dehumidifying. To help stop the evaporation the building will be heated, hence the desire to insulate.
Where do you get composite coloured cladding?
Concrete fibre boards are pretty robust and self coloured
such as
https://www.marley.co.uk/cladding/marley-weatherboard
and these suppliers (marley is one of many) do nice matching trims, clips etc
most places that do composite decking do cladding too. I haven't ordered any yet just costed it up. I'm looking at cladco
I was looking for something that looks ok as an interior so whilst going for composite weatherboard outside, something smooth inside. I guess could be shiplap/t&g but pref was flat.
I'd be visiting central plastics or gap plastics to look at what's available.
I think the screens you can get in composite are quite nice and a bit different if yiy didn't want t&g. lots of designs. could even run some coloured leds behind them for a bit of mood lighting
@DT78 and @trail_rat Do you have any links?
I had a google of gap and central and then browse of their websites (I’m south east so neither local to me to visit in person) but couldn’t seem to find a cladding product.
Central have about 20 of the 20000 things they actually sell on their site.
These types of company don't do online.
Look for. A local plastics company and visit.
I can't vouch for these companies, you have several options. order some samples and see what you like
screens like these big ones I've been looking at 1800 x 900. plenty of patterns
https://www.luxuryscreens.co.uk/
this is cladding I'm looking at. if you only need a small amount you maybe better trying to source local. often delivery is expensive unless over a certain amount
with the compostie screens you get 2 thickness. 5mm if decorative and hung on something. 16mm if meant to be freestanding like a fence panel
see hot tubs which are basically a gazebo with these on the sides. not fully enclosed but does provide privacy and looks nice. not insulated in anyway, but you will have no worries with ventilation or rot
depends what you are after. I'd say fully enclosing a hot tub might be a bit of a pain. but I don't have one, so not talking from experience!
pretty certain WCA of this forum custom built one a few years back that was enclosed
Fully enclosed currently in a form of glazed bubble. Glazing is Perspex or other coloured transparent plastic. Or at least earlier in it’s life it was transparent now it lets light through but the bits that have been in direct sun have stopped it being transparent. Twin wall Poly carbonate roof which I think can be replaced like for like but the walls was thinking of trying to insulate.
For those questioning why insulate an outbuilding that's unheated... I have exactly this at present. This time of year (and the reverse period in March T April) I get a whole load of condensation in it , because the air outside is really quite moisture-laden. When there's a temp difference between the air coming in and the contents of the garage all warmed up by the sun hitting the garage in the daytime (bikes, boxes of stuff etc inside) then cooling in the eve / niggt, it condensates like mad. Then goes mouldy when the air temp rises again. It can cycle like that twice a day at the worst times of year (like around now).
It's not for the lack of air flow. It's a temperature difference thing plus a lag between the air temperature changing and the contents temperature changing.
I'm just about to have an insulated door (that also seals better) installed to hopefully help (and also improve security whilst at it).