Moving Roof Purlins

The purlins you refer to i think would more properly be called either collar ties or rafter ties.

Moving roof purlins.

How to install purlins. Purlin plates are beams which support the mid span of rafters and are supported by posts. By supporting the rafters they allow longer spans than the rafters alone. What s the point of moving the purlin anyway just clean it up and expose it or board it.

Install the second row of purlins just like the first cutting the end piece to fit. The exisiting purlin is 10 2 i will replace like for like. Install the second row of purlins just like the first cutting the end piece to fit. When positioned roof purlins should be spaced no further than 1 2 metres apart when using sheeting with a thickness of 0 7mm and 1 metre when using 0 5mm sheeting.

These help prevent separation at the ridge as a tension brace and also help prevent rafter sag from roof loading as a compression brace. In order for the sheets to be easily fixed to the purlins as a rough guide they should be at least 50mm wide. I will be putting in 9x3 floor joists. Snap the third chalk line two more feet down and continue down the roof until it is covered with purlins.

Any expert views much appreciated. Hi i am thinking of having my loft converted i need to move the purlins down to do this i need to install new 6x2 rafters next to the 4x2 rafters. Internal roof elements to consider during loft conversions consist of a number of sub structures such as ridge boards rafters purlins joists wall plates and steel beams. Snap the third chalk line two more feet down and continue down the roof until it is covered with purlins.

Mike mikewilliams416 13 aug 2012 1. My question is how do i prop up the rafters so i can take down the existing purlin to insert the new rafters before building a timber structural wall further down to support the rafters the roof. Move two feet down the roof and snap a horizontal chalk line. Purlin plates in wooden construction.

The term plate means a major horizontal supporting timber. In the roof space as the name suggests the ridge board is the length of timber which runs horizontally along the apex of the roof. This one has held the roof straight for 60 years so no need to change i think.