Garden Shed Construction

Garden sheds not only come in all shapes and sizes but they also have different types of construction. The three that are the most common are overlap, tongue & groove and overlap matching.

Overlap Sheds

Overlap sheds are the easiest and cheapest of the three construction types to manufacture and so they are relatively less expensive. 

Basically, 8mm rough-sawn timber boards are nailed to the vertical bearers of the shed and overlapped. The overlapping of the boards allows the timber to shrink and expand easily - which it naturally does throughout the year – but without warping. The overlapping also allows the rain to run away but overlap boards do not form a close seal so they are more prone to moisture ingress and draughts. Not a problem if the shed is to be used for garden storage but if you intend to spend a lot of time in there, say, for a hobby or leisure activity, you should consider a tongue & groove or overlap-matched shed. 

Tongue & groove and overlap-matched sheds are slightly more expensive than overlap ones but the additional cost can be worth it for the extra weather-proofing (and comfort!)

Tongue & Groove Sheds

Larger sheds that are more likely to be used as garden workshops are made using a tongue & groove construction (also known as shiplap sheds) and with thicker, smooth-planed 12mm boards. The interlocking of the thicker boards leaves no gaps and means that the shed is better protected from draughts and rain - essential if you spend many hours in there. Also because 12mm boards are used, there is less movement in the wood due to seasonal variations in temperature and humidity.

Overlap-Matching Sheds

An overlap-matched construction is usually reserved for premium sheds and workshops. Overlap-matched sheds use a thicker, smooth-planed 12mm board that combine the best of both overlap and tongue & groove construction techniques. The boards interlock like tongue & groove to provide draught and rain proofing and they also overlap each other slightly for greater movement without warping.

Next: Garden Shed Roof Styles