Garage Roof Joist Spacing

Let s consider a basic gable wood roof framing design.

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. The full version allows any size. Builders aren t bound by standard rafter spacing measurements. But they do tend to space rafters in one of several industry standard increments typically.

For pitched roofs flat roofs and ceiling joists. This demo version is fixed at 1m clear span. Surveyors span tables for designing roof rafters. 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. If this is the case with your structure use the floor joist table to determine maximum joist length load. Flat roof joist calculator. This is the distance between joist centres.

Usually 400 450 or 600mm but any value can be used up to 610mm max. 1 enter joist details 1 1 span and joist spacing. Here we have a wood framed gable roof. Interior spaces that exceed standard sizes such as family rooms and garages require different dimensions in the size of the joist the joist spacing and the joist span.

Continuing on from part 3. Joist span tables use these tables to determine lengths sizes and spacing of ceiling joists.