If

double L with winders and landing

and C) or ploughed (Fig. 96C) to fit the outline of the treads and risers.

Stringers should not be less than 1 in. (25 mm) thick when they are supported along their length or 11/2 in.

wide U

wide U

(38 mm) when supported only at the top and bottom. The overall depth should be at least 9 1/4 in. (235 mm), and when the stringer is cut out to fit the treads and risers, the portion remaining should not be less than 3'/2 in. (90 mm) deep. A third stringer should be used when the width of the stairs is more than 35 in. (900 mm). This may be increased to 48 in. (1200 mm) where risers support the front of the treads. Treads should be at least 11/2 in. (38 mm) thick when used with open risers. This thickness can be reduced to 1 in. (25 mm) where the stringers are not more than 29 in. (750 mm) apart or where the tread is supported by a closed riser attached to the treads.

The wall stringer may be ploughed out to the exact profile of the tread and riser with sufficient space at the back to take wedges (Fig. 96C). The top of the riser may be connected to the bottom of the tread by angle-blocks glued to both surfaces, screws being added to reinforce the joint. The bottom of the riser is attached to the back of the tread with screws (Fig. 96B). Another method is to tongue the top of the riser into the front of the tread and the back of the tread into the bottom of the next riser (Fig. 96A). The wall stringer is nailed to the wall, the nails being located behind the treads and risers. The treads and risers are fitted together and forced into the wall-stringer nosing, where they are set tight by driving and gluing wood wedges behind them. The wall stringer thus shows above the profiles of the treads and risers as a finish against the wall and is often made continuous with the baseboard of the upper and lower floors.

If the outside stringer is an open stringer, it may be cut out to fit the risers and treads. The edges of the risers are mitred with the corresponding edges of the stringer, and the nosing of the tread may be returned on its outside edge along the face of the stringer (Fig. 96D).

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