Doubling up purlings

[Mark0395]

Hi first time posting here.

I’ve started a barn conversation for myself to live in. (First time doing this and for my first home).

I need to double up the Purlins. From this diagram I assume the notch is out the Purlin rather than the Truss Rafter.

I’m really struggling to find a suitable/ figure out how to get a joist hanger in as well. I have put 2 purlins up today, had to acro the existing purling up to lift the rafters high enough to get the new purlins in. No idea how I will get a hanger on or what strapping to use. I have 10 more Purlins to do.

Any advice would be greatly appreciated.

 

[Dereekoo]

Surely its just a case of sliding a joist hanger over the new notched purlin before placing it on the rafter, some thing like this

Galvanised Single Piece Masonry Hanger 100mm / 150mm / 200mm x 50mm

Galvanised Single Piece Masonry Hanger 100mm / 150mm / 200mm x 50mm is a single piece jiffy hanger that is used to support timber joists built into brick or block wall

www.aboutroofing.com

Obviously normally the lip is fixed into brickwork but as the purlin is resting on top oi it with all the associated roof load its not going to go anywhere

 

[Mark0395]

Thanks for replying. There are 12 purlins, 8 ends go into walls the rest are on wood A frames. Do you know if the do that sort of bracket 75mm wide, 70mm high before the bend. Also all the hangers would need to be a slightly different height as the space is different at each A frame with the barn being around 200 years old.

 

[Mark0395]

Forgot to add these

 

[Dereekoo]

This is nearest thing I found, guess you will need to chock any spaces or cut more off the rebate, back to SE ?? https://www.builderdepot.co.uk/100m...iQgvvnOHV6ZVzU9ceMyxlwZJplkdFyyRoCQ74QAvD_BwE

 

[freddiemercurystwin]

But as he needs to use two hangers back to back he'd have one sitting over the op of the other.

 

[Dereekoo]

But as he needs to use two hangers back to back he'd have one sitting over the op of the other.

Looks as if new purlins are staggered either side of old ones so not back to back?

 

[Mark0395]

Looks as if new purlins are staggered either side of old ones so not back to back?

new purlin are attached to old purlins with bolts. From one section to the next section of roof they are staggered.

 

[Mark0395]

This is nearest thing I found, guess you will need to chock any spaces or cut more off the rebate, back to SE ?? https://www.builderdepot.co.uk/100m...iQgvvnOHV6ZVzU9ceMyxlwZJplkdFyyRoCQ74QAvD_BwE

Sorry I’m slowly learning all the terms for wood work “SE”? “Rebate”?
I usually work with pipes and pumps so house building is new to me

 

[Dereekoo]

SE Structural Engineer, rebate, basically a section of wood cut away for another piece of wood to fit into

 

[noseall]

SE Structural Engineer, rebate, basically a section of wood cut away for another piece of wood to fit into

You don't half rabbet on.

 

[Dereekoo]

You don't half rabbet on.

School woodwork lessons many many many years ago, forgot about that term

 

[jks7492]

Are the existing purlins notched or is it actually the trusses that are notched to support the purlin?

 

[Dereekoo]

Are the existing purlins notched or is it actually the trusses that are notched to support the purlin?

?? As per photos

 

[jks7492]

?? As per photos

Maybe my eyes but looks to me like trusses are notched?