Healthy Housing Insight

Attic Rooms

The Healthy Housing principle of affordability and economic viability may be promoted by considering future conversion of the attic into habitable space. Through proper planning, it may be converted into a high quality living space, deferring Initial construction costs until resources are available and needs arise.

Consider these features when planning attic rooms.

Truss attic space

I Roof trusses are structurally more efficient than framed roofs; however,ir 11 the webs do not permit future conversions of the attic into habitable spaeeĀ» jl

ridge beam required with knee walls select roof framing system to accommodate insulation collar tie (optional)

recommended 1:1 minimum roof slope size ceiling joists as floor joists optional knee wall recommended minimum height 5'-6" (1.65 m)

Plan stairwells in the house so that they may be extended to the attic space, or determine an appropriate future location for outside stairs.

Size ceiling joists as floor joists, and use insulation which may be transferred to the roof assembly during conversion. Ensure that the roof assembly will accommodate sufficient insulation with an air space above.

Continued 011 |or.i;i- 102

Continued from page 101

A roof slope of 1:1 or steeper is recommended, particularly if a knee wall is not provided. If a knee wall is provided, check local by laws regarding height restrictions of the building.

Rough in or plan for future services such as electricity, plumbing, heating, ventilation, and telephone.

With the addition of elements such as dormers and skylights, properly planned attics may be converted into high quality living space, easily and economically.

the wall should be supported by framing members called "lookouts" (Fig. 60). The gable-end studs are placed with the narrow face parallel to the sheathing, and a top wall plate is added. The lookout members, usually the same size as the rafters, are spaced at 24 in. (600 mm) on centre. The ends are supported by end-nailing to the first rafter and to the header, and toenailing to the wall plate. Blocking is then fitted between the lookouts at the wall line to support the roof sheathing and inner edge of the soffit covering. The soffit covering is nailed to these supports, and a fascia is added as previously described. The length of lookout members should be about twice the width of the roof overhang. A double rafter is used to support the inner ends of the lookout members when they project into the roof more than one and one-half rafter spacing.

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