Garage Roof Joist Spacing

The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.

Garage roof joist spacing.

This demo version is fixed at 1m clear span. This is the distance between joist centres. For pitched roofs flat roofs and ceiling joists. But they do tend to space rafters in one of several industry standard increments typically.

Rafter and roof joist spacing is only one part of a complex roof design that works together to form a structure that meets building codes and can hold up the weight of the roof and roof load. Continuing on from part 3. Let s consider a basic gable wood roof framing design. Joist span tables use these tables to determine lengths sizes and spacing of ceiling joists.

Builders aren t bound by standard rafter spacing measurements. Surveyors span tables for designing roof rafters. Here we have a wood framed gable roof. Floor beam span tables of residential structural design we will now look at roof rafter and beam design.

Surveyors and structural engineers utilise data from tables below to help calculate the correct size strength and centres of roof timbers for the required spans and loadings. In these cases 2 inch by 10 inch lumber is often used for ceiling joists although trusses may be more practical. 1 enter joist details 1 1 span and joist spacing. Flat roof joist calculator.

If this is the case with your structure use the floor joist table to determine maximum joist length load. Usually 400 450 or 600mm but any value can be used up to 610mm max.