Roof Truss Spacing Requirements Slate Roof

Weather you re building a shed roof or adding a dormer to your second story it is important to choose the proper size rafter.

Roof truss spacing requirements slate roof.

More often than not the roof structure is assembled from a series of roof trusses. Roof design depends on a number of factors including the type of covering you are going to use and the span over which the roof structure is to be supported. These steel joints are needed to support the overall truss. This is the distance between trusses.

Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge. Spacing a live load deflection limited to l 240 maximum and use lumber properties as follows. There are several variables to consider when determining the proper rafter size. The steeper the roof the more expensive the trusses get because the longer the boards get and the more roof area increases.

These standards are as follows. 2x4f 2000psif 1100psie 1 8x10 2x6f 1750 psi f 950 psi f 1900 psi e 1 8x10. This means that if you re in charge of repairing or installing roofing trusses you ll be expected to hold to these standards. There are many roles played in the design and delivery of residential wood roof trusses.

Follow this guide to ensure the spacing and stability of your diy roof trusses. Typical roof truss. The more complex the truss framework is the greater quantity of these joints will be required. Although the standard spacing of roof trusses may be the same as that of rafters with 24 inch spacing being a common option the design of a truss may allow for the use of a lower grade of lumber than would be.

Allowable spans for 2x4 top chord trusses using sheathing other than plywood e g. You will also incur additional costs because it is much harder to deck and shingle a roof that is 12 12 pitch versus a 4 12 roof. To determine how many trusses to create you will first need to measure both the width and the length of the structure you are building. The standard roof truss spacing is 2.

Standard roof truss spacing. The same thing is true for the bridge of the truss. The trusses should be a little longer than the exact width to allow for overhang and you will need sufficient trusses to mount across the length. Spaced sheathing or 1x boards may be reduced slightly.

This article discusses the scope of work required of the various roles as defined by the various codes and standards for residential roof truss. These rest on wooden wall plates and are designed to span the walls of the house. This sizing guide for roof rafters will help determine what you need for your small project.