Once the foundation is in place, a roasted ACQ treated wood floor (can be insulated with polystyrene or urethane) is laid on top of it. Laying tongue-and-groove plywood on top of the foundation serves as a starting point for installation of the floor’s interior finish (some finishes require greater preparation). The floor covering inside the solarium is entirely up to the buyer. 
The exercise continues with the roasted ACQ insulated wall (can be insulated with polystyrene or urethane). Varying in height, it is closed on the exterior with plywood. It is ready to receive a wide variety of finishes, such as fiberboard siding (Canexel), aluminium, aggregate, stone, brick, etc. (Selection of some finishing materials requires greater preparation). .   
Interior finishing of the low wall is up to the buyer. As in the case of the floor, it is very important that all the materials used inside a Three Seasons solarium are waterproof.
Roasted ACQ treated wood stringers are fastened to the solarium’s receiving wall. Installed along the entire perimeter, they serve for levelling and squaring of the right angles, essential to installation of a glazed room.  
The single glass of the Three Seasons solarium obviously is uninsulated. The use of auxiliary heating in cold weather is not recommended. The temperature contrasts will create profuse humidity and ultimately mould will appear.
Whether because of view restrictions or to ensure privacy, a blind wall can be constructed with the same characteristics as a low wall. A party wall is designed as a firewall according to municipal standards..
Installation of an insulated false roof (wool insulation or urethane) on a street-level house is necessary, more often than not, to meet the required slope and height standards. This false roof may have one or two lean-tos. A ventilation opening is made between the existing roof and the new roof. The latter receives the same exterior finish as the former. A three-foot clearance is left around the rim of the false roof to allow installation of a waterproofing membrane on this entire surface.

Regardless of the substance used for the Three Seasons solarium (glass, plexiglas, polymer, etc…), a permanent installation requires a construction permit issued by your municipality, which is always compulsory. This type of solarium is subject to the same standards (lateral and rear setbacks, view restriction, radiating surface, etc…) as any other (Four Seasons, Three Seasons, etc.).
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