# How do you find the load width of a roof?

Contents

Roof load width (RLW) = rafter span (if placed at midspan) otherwise ½ span1 + ½ span2. RLW × (½ u/p span left + ½ u/p span right + spread of fan strut). Hanging beams are required if ceiling joist span is excessive.

Whether the bearers are supporting load bearing walls or only floor loads, the area of the floor supported by an individual bearer must be determined. This is referred to as the floor load width (FLW).

## What does roof load mean?

Roof loads are a downward (vertical) force on the home. The North Zone, Middle Zone and the South Zone are identified on the roof load zone map above. This downward imposed load on the home is also known as the snow load.

## How do you calculate building load?

Dead load = volume of member x unit weight of materials. By calculating the volume of each member and multiplying by the unit weight of the materials from which it is composed, an accurate dead load can be determined for each component.

## How much load can a roof take?

The dead load of a typical asphalt-shingled, wood-framed roof is about 15 pounds per square foot. The load increases with the use of heavier roofing material. A clay-tiled roof may have a dead load of as much as 27 psf.

INTERESTING:  Is roofing all year round?

## How do you calculate floor loads?

Multiply the maximum load per square metre by the total area of the floor. If the example floor is 6 by 9 metres (20 by 30 feet), the total area is 54 square metres (600 square feet); 54 x 269 = 14,526 kg (32,024 lb). This number tells you the total load capacity of your floor.

## How far apart can bearers be?

Set up the bearer spacings at a minimum of 1800mm centres with stump holes no more than 1500mm apart. The outside run of stumps will need to align with the outside edge of the deck.

## What is the roof live load?

The weight of temporary objects on the roof is referred to as the live load. Live loads include the roofing crew and the equipment and tools they bring with them. A roof must be able to support both its dead load and live load at any given time.