Exposed Timber Roof Structure Deck

For best results refer to our wood and composite deck joist span table.

Exposed timber roof structure deck. Roof deck and composite floor deck. It covers the most common timber species and deck sizes. When you are building a patio cover off of an existing roof or wall you must take all of your measurements from the point at which the patio roof will attach to the existing structure not the outside of the slab. Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter.

Patio cover plans building. The roof rafters provide integral structural support to the roof. Joist spans l less than or equal to. In typical deck construction with a ledger on one side of the joist and beam on the other the size of the joists is driven by the size of the deck and based on the general maximum spans mentioned above.

This data sheet contains tq s recommendations for residential timber decks verandahs patios etc which are exposed to the weather. That means that not only does it act as a roof for the underlying structure it also acts as a deck membrane. The existing slab can vary considerably throwing off crucial measurements. The roof extends over the southern and western elevations to provide the l shaped cantilevered deck some.

Dimension lumber deck beam spans l b 1 for joists framing from one side only. Species size4 6 8 10 12 14 16 18 southern pine. Construction are used in other types of construction. But wood rot is a slow process where the fungi start to grow and feed on the cellulose in the wood.

Wood rot can and will start when the moisture content of the wood reaches 20 percent. A bronze seamed roof tops the building for a visual contrast with the timber cladding. Several provision s in the ibc allow heavy timber construction in l ieu of fire resistant rated construction. For example heavy timber construction can be used in roof construction of all types of construction requiring a 1 hour fire resistance rating if the designer chooses figure 4 4.

The deck is a structural panel that spans over roof joist or purlins to provide a flat surface on which to apply the weatherproof roofing. Footing sizes and deck bracing shall be designed in accordance with the building code of australia bca regulatory requirements. 6 prescriptive residential wood deck construction guide american wood council table 3a. Steel deck is the substrate for most roofing materials such.

Here s how tufdek waterproof decking stands out on a flat roof deck.