To level the wall plates i find the straightest joist, lay it from one wall plate to the other and put an 1800mm spirit level on it. adjustments may need to be made before you start the roof by measuring your span. the span is the measurement from the outside of one wall plate to the outside of the opposite wall plate.. Self supporting lean to roof system this wall plate has been specifically designed as part of our heavy duty self support roof system. this system has all the parts needed to install a lean to roof and comes in white or brown.. The piece fixed to the wall where the top of the rafters are on the drawing isn't a wall plate it's a ledger board and this wouldn't normally be 4x3 either,more likely to be 6x2 with plumb cuts on the rafters sitting in shoes..
Lean-to roofs. the simplest of pitched roofs is the lean-to roof, commonly found forming the rear extensions to terraced housing. the sloping timbers are known as rafters and are supported at the top by building them into the solid wall (not recommended nowadays) and at the bottom by securing to a wall plate.. A lean-to is an open structure that is dependent on another structure for support. it consists of two independent supports, such as poles, and a sloped roof. the roof is attached to the exterior wall of a stable structure. the two poles support the low end of the roof. the sides and front are open to the elements.. Roof construction roof terminology (cont.) purlin - this is a strong, large sectioned timber member which, is fixed to the common rafters midway between the ridge and the wall plate and runs parallel to the wall and the ridge. on gable roofs, the ends of the purlin are built into the gable walls..
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