Install the second row of purlins just like the first cutting the end piece to fit.
Moving roof purlins.
The exisiting purlin is 10 2 i will replace like for like.
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.
What s the point of moving the purlin anyway just clean it up and expose it or board it.
Snap the third chalk line two more feet down and continue down the roof until it is covered with purlins.
Purlin plates in wooden construction.
How to install purlins.
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.
The term plate means a major horizontal supporting timber.
Any expert views much appreciated.
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.
Snap the third chalk line two more feet down and continue down the roof until it is covered with purlins.
I will be putting in 9x3 floor joists.
The rule of thumb is to locate these cross braces one third of the distance below the ridge.
This one has held the roof straight for 60 years so no need to change i think.
By supporting the rafters they allow longer spans than the rafters alone.
Install the second row of purlins just like the first cutting the end piece to fit.
The purlins you refer to i think would more properly be called either collar ties or rafter ties.
A purlin plate in wood construction is also called an arcade plate in european english under purlin and principal purlin.
In order for the sheets to be easily fixed to the purlins as a rough guide they should be at least 50mm wide.
Move two feet down the roof and snap a horizontal chalk line.
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.
Mike mikewilliams416 13 aug 2012 1.
Move two feet down the roof and snap a horizontal chalk line.
