Roof Load Width Verandah

If you have single span rafters of 4 8 mtrs the roof load width is 2 4 mtrs.

Roof load width verandah.

When you refer to a beam s allowable span what you re really describing is the allowable spacing between posts. Verandah beams gl8 sheet roof 21 verandah beams gl8 tile roof 24 ridge beams f7 42mm sheet roof 25 ridge beams f7 42mm tile roof 28. Ns not suitable. The maximum overhang of house rafters or trusses shall not exceed 750 mm from outside of top plate to end of rafter truss.

This video explains all the details of calculating the roof load width rlw for a variety of roofing types. The size of the roofing material is needed to calculate how much load the roof members and substructure need to support and therefore what size the underlying timber parts need to be. Size grade continuous span verandah beams span values in mm roof load width mm 900 1200 1500 2400 3000 4000 5000 6000 140x35 f7 3600 3400 3100 2400 2200 1900 1700 1600 190x35 f7 4800 4500 4000 3200 2900 2500 2300 2100 140x45 f7 3900 3500 2800 2500 2200 2000 1800 5300190x45 f7 4800 3800 3400 3000 2700 2500. This number represents the total load that your roof must carry.

Roof beams 20 verandah beams 22 garage roof. Multiply the load per square foot by the total area of the roof. If you can source a beam of 6 5 mtrs long in one piece the size required would be 240 by 45 in f5 or f7 or mgp 10. If an example roof is 10 feet by 20 feet the total area is 200 square feet.

Multiplied by 40 pounds per square foot equals 8 000 pounds. The roof load width is half of the rafter span. For the pergola beams shown in illustration the roof load width is the dimension representing half the rafter span plus any rafter overhang. Pitching beams 23 common installation details 25 notches cuts and holes in beams bearers joists and rafters 26.

For any particular load the allowable span of patio cover joists and beams depends on wood species and board size. You would require three post to cover the 6 5 mtrs of beam length. Refer to as1684 2 and 3 clause 2 6 4 for other configurations. Size grade single span verandah beams span values in mm roof load width mm 900 1200 1500 2400 3000 4000 5000 6000 140x35 f7 25002300 2100 1800 1600 1500 1300 1200 190x35 f7 3400 3100 2900 2400 2200 2000 1800 1700 2700140x45 f7 2500 2300 2000 1800 1600 1500 1300 190x45 f7 3700 3400 3100 2700 2400 2200 2000 1800.

For sheet roofed houses with 900 mm rafter spacing in wind classification n4 or c2 the minimum size of f5 or mgp 10 rafters or top chords shall be 90 x 45 mm.