Gable ends take the worst of the wind-driven rain a house has to offer, and when render starts to craze or pointing gives up, cladding is one of the most reliable fixes going — and one of the most satisfying jobs to do yourself. The work is not complicated, but it is unforgiving. Get the measuring and the battening right and the cladding will sit flat, shed water and last for decades. Get them wrong and you will spend years chasing leaks and wavy boards.
A gable is mostly arithmetic. Break the elevation into simple shapes: a rectangle for the main wall, and a triangle for the part that rises to the apex. The triangle is easy — half the base width multiplied by the height from the eaves line to the peak. A gable 8m wide with 2.4m of rise above the eaves gives you 4 × 2.4 = 9.6m². Add the rectangular section below, subtract windows, doors and vents, and you have your net area.
Measure the base along the eaves line, at the widest point of the triangle, rather than where the wall happens to stop. Then measure the rake — the sloped distance from eaves to apex — either by running a tape along the roof edge or working it out from the rise and half-span. You will need that figure for trims, and for estimating how much of each batten is lost to angled cuts.
Order around 10% more cladding than your net area for a straightforward gable, and nearer 15% if there are dormers, awkward corners or a steep pitch producing lots of offcuts. Trims are where people come unstuck, because corner, starter and verge profiles are sold by the length. Measure each run individually and add a little for laps and cuts rather than guessing a total.
Cladding is a rainscreen, not a waterproof layer. Water will get behind it; the trick is making sure it can drain away and dry out. That means a breather membrane lapped so water runs down the face of the wall rather than into it — commonly 100mm horizontally and 150mm vertically — with taped joints and the top edge dressed over the wall plate or into a verge detail.
Then you need a clear cavity of at least 25mm between the back of the boards and the membrane, ventilated at both the bottom and the top, with insect mesh over the openings. Moving air through that cavity is what dries the back of the boards and the face of the wall. Two things kill it faster than anything else: pushing insulation hard against the membrane, and sealing up both ends of the cavity. Keep it clear and keep it open.
Battens create the cavity and give you a flat, straight fixing plane. Use treated timber, and get the direction right: vertical counter-battens fixed to the wall create the drainage cavity, then horizontal cladding rails carry the boards. Vertical cladding needs those horizontal rails; horizontal boards can go straight onto the vertical battens.
Space everything to suit the board. Around 600mm centres is common, but joints need extra support and exposed sites need closer spacing, so follow the manufacturer's figures over habit. Set out from the bottom up so the top course is not a 40mm sliver, check each batten with a long straight edge or a laser, and pack where the wall is out of true. Never bend a batten to follow the bumps.
Work from the bottom up off a known level line. The bottom edge of the cladding should finish at least 150mm above ground level or above the DPC, sitting on a starter trim that throws water clear of the wall below.
Keep laps generous — usually somewhere between 25mm and 35mm depending on the board — and always arrange them so the upper board overlaps the lower one, letting water run off the face instead of into a joint. Fasten into the battens, never into the thin edge of a board. Pre-drill fibre cement and composite near the ends, do not overdrive the fixings, and use corrosion-resistant nails or screws.
Leave the movement gaps the manufacturer specifies. Boards expand and contract, and a tight butt joint with a fixing through it is a crack waiting to happen. A few millimetres between board edges, and roughly 8–10mm at ends, corners and against trims, is typical. Stagger vertical joints where you can, and keep them off batten joints.
Most cladding leaks on a gable end begin at the rake. The boards have to finish under something — a verge trim, a bargeboard flashing or a purpose-made gable profile that laps over the top edge and includes a drip to throw water clear. Never leave the top edge of a board open to the sky, and never rely on sealant alone at that detail.
For the rake cut, set a sliding bevel or make a template from the pitch, then test-fit one board before you cut a whole stack. At external corners, fix the corner trim to the battens first and let the boards run behind it with their movement gap, rather than butting boards into one another and hoping. Internal corners get the same treatment, with the trim lapping the right way.
Clean the boards as you go — cement dust and fingerprints set hard. Check that every cut edge is protected with the appropriate trim or edge profile, and stand back at the far end of the garden to sight along the wall. A proud batten or a board that has wandered shows up instantly from distance, and it is far easier to correct now.
Two parts of this job are worth handing over. Anything above first-floor level is a scaffolding job, not a ladder job, and if the property is listed or sits in a conservation area, the cladding material may need consent before you order it. If the gable turns out to have failed render, damp blockwork or a hidden structural problem behind it, have a roofer or surveyor look before you cover it up — cladding hides faults rather than fixing them.
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