12/6/12

This morning we went back over Trigonometry and Pythagoras in regards to the Roofing and trusses.We went up stairs and started with the session.SOH CAH TOA was shown to us,this is used to find angles,and sides in a triangle,and a2+b2=c2 is used for finding a missing side.These formulaes are highly accurate and useful on a building site.A lot of time is saved using these methods.They are Plain and simple,easy to remember.SOH CAH TOA are drawn up into 3 triangles to make it super easy to find out which one to use for what ever problem that may occur.

Purlins being nailed off and checked for straightness.

Once we had gone over the mathematical side of things we then moved on with the build down stairs.We had to then calculate the amount of rows of purlins needed for the roof.We set up the first row down the end of the trusses,at the top end we measured 150mm down,then got the inside to inside measurement of the length of the trusses and divided it by 815mm,the overall measurement was 3605mm in length.We lended up with 6 rows of purlins,We also cut the hip purlins to the right angle and since they were short,we cut them over a trusse so they can be joined over something sturdy.Most of them have been installed to place.Two 4 inche nails were used to nail them down at the top and bottom.A purlin screw is to be put in the middle.

Purlins.

Soffits will then be installed once we have everything else sorted.