Garden Room Cladding Compared
Cladding is the part of a garden room everyone sees and the part most likely to be regretted. All the mainstream options are durable enough; the differences are in how they age, how much you have to do to them, and whether you like the colour they turn on their own.
Western red cedar
Naturally durable, light, stable and easy to work. Left untreated it silvers to a soft grey, unevenly at first, with the exposed elevations moving faster than the sheltered ones.
If you want it to stay honey-coloured you are committing to a UV-protective oil every year or two. Most disappointment with cedar comes from expecting it to hold its original colour without that.
Thermally modified timber
Softwood heat-treated to improve stability and durability. It is dimensionally calmer than untreated softwood, takes a dark stain well and is usually more affordable than cedar.
It also silvers over time and is slightly more brittle to work with, so fixing detail matters more.
Larch and other softwoods
Siberian larch is dense, hard-wearing and cost-effective, with a slightly knottier appearance. It weathers to grey and can be left untreated, and it is a sensible choice where budget matters more than a fine-grained finish.
Cedar: finest appearance, lightest, highest material cost · Thermowood: stable, mid cost, takes dark finishes well · Larch: hardest wearing softwood, knottier, most economical · Composite: consistent colour, no oiling, less natural in close-up
The detailing matters more than the species
Whatever the material, longevity comes from the build-up behind it: a ventilated cavity so the back of the boards can dry, a breather membrane, stainless or appropriate fixings, correct board overlaps and enough clearance from ground level to avoid splashback.
A cheaper board fixed correctly will outlast an expensive board pinned straight to sheathing with no ventilation gap.
Frequently asked questions
Does garden room cladding need treating every year?
Only if you want to keep its original colour. Left to weather naturally, durable species need no treatment for structural reasons — the change is purely visual.
Will cladding go grey evenly?
Rarely at first. Elevations that get sun and rain silver faster than sheltered ones, and the difference evens out over a few years rather than immediately.
Is composite cladding worth the extra cost?
It suits people who want a fixed colour and no maintenance. Up close it reads as a manufactured product, and it moves with temperature, so fixing gaps need to follow the manufacturer's instructions precisely.
Can cladding be mixed on one building?
Yes, and it works well — a feature elevation in vertical boards with the rest horizontal, or timber to the front and a painted board to the rear where it is not seen.
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