Anything beyond that you are looking at using 2圆s for most sheds. If you look at the rafter span chart, you’ll notice that 2x4s can be used for rafters on spans up to 11 ½’. Visit the roof framing page for more information on cutting roof rafters, and visit the roof pitch calculator for determining rafter lengths based on rise and run. You will possibly be required to double up the rafter around the window area, but as this in itself is causing more weight on the entirety, you may well have to increase the rafter sizes.įor these reasons, and more, I recommend using truss roofing when possible as the system works everything out for you, cheap in manufacture fast and easy fixing and acceptable by the jolly old building inspector. The pitch and span of your roof will dictate how long of a rafter you’ll need use maximum span calculator to help you find your rafter size. I think you would need to consult someone qualified to calculate the rafter sizes whilst taking into consideration, the roof covering layers, insulation, air gap, location of the velux windows etc. You must consider the following: Design lean-to roof per your local building codes. Live load is weight of furniture, wind, snow and more. dead load (weight of structure and fixed loads) 15 lbs/ft2. When building lean-to addition, there are few things you need to keep in mind. Douglas fir maximum horizontal roof rafter span for Lumber Grade Selected Structural and No. Rafter spacing 763.5 (adjusted to fit evenly) (Next larger spacing 827.1 Next smaller 708. Fitting Velux windows will mean trimming out the "gaps" to accept the windows.Īs the table CHJ has kindly posted shows 150mm x 47mm cntrs is acceptable, when you cut out for the windows, you will cause more weight and stress on the remainder, having to take the weight. On this page youll find drawings and free PDF plans to build 8, 10, 12 and even 16 wide lean-to overhangs.
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