Rafters on masonry hangers?

[BadgerBadger]

Moving onto roofing and back at the bottom of the learning curve! 

 

We're building an L-shape with a fairly restricted ridge height.  It's a masonry build with timber roof and the rafters land on the wall plate with birds mouth cuts.   I've hit a bit of awkward detail - there's an internal door that goes through the structural dividing wall between the two sections but the head height is working out a bit too low.  We can't push the lintel any higher without moving the wall plate, and are at the limit of how deep the birds mouth cuts will be.

 

What are my options?  We can happily build the masonry around the door higher to accommodate the increased lintel, can I use masonry hangers in this area to support the angled rafter instead of a wall plate/birds mouth?

[Rishard]

Simple answer is yes, you can stop the wall plate either side of lintel and use a ledger board bolted to the masonry and into the lintel to fix your new rafter ends too. You can mount the hangers to the timber ledge. 
 

Do you have a valley junction in this area too with it being and Lshape build? 
 

[nod]

We’ve had massive issues with the Arts and craft roof design 

What I thought would take me a week Ended up taking me a month Eight valleys and two doors that shouldn’t have been there Everything birds mouthed including the trusses and far more loose rafters than intended 

I had to cut masonry hangers into the walls in places 

I can take some photos if it would help 

But would have to go to an email As I can only place one photo at a time on here 

[nod]

1 hour ago, nod said:

We’ve had massive issues with the Arts and craft roof design 

What I thought would take me a week Ended up taking me a month Eight valleys and two doors that shouldn’t have been there Everything birds mouthed including the trusses and far more loose rafters than intended 

I had to cut masonry hangers into the walls in places 

I can take some photos if it would help 

But would have to go to an email As I can only place one photo at a time on here 

[Dave Jones]

12 hours ago, BadgerBadger said:

Moving onto roofing and back at the bottom of the learning curve! 

 

We're building an L-shape with a fairly restricted ridge height.  It's a masonry build with timber roof and the rafters land on the wall plate with birds mouth cuts.   I've hit a bit of awkward detail - there's an internal door that goes through the structural dividing wall between the two sections but the head height is working out a bit too low.  We can't push the lintel any higher without moving the wall plate, and are at the limit of how deep the birds mouth cuts will be.

 

What are my options?  We can happily build the masonry around the door higher to accommodate the increased lintel, can I use masonry hangers in this area to support the angled rafter instead of a wall plate/birds mouth?

 

you need to ask whoever designed the cut roof (SE?) as tinkering with his design (if BCO spots it) will be an issue.

 

why are you struggling for head height ? a standard/low ceiling is 2.4m a normal door 1.98m. You are lower than this ?

 

There are some workarounds but curious why the design has failed.

 

[BadgerBadger]

On 27/03/2023 at 08:58, Dave Jones said:

 

why are you struggling for head height ? a standard/low ceiling is 2.4m a normal door 1.98m. You are lower than this ?

 

 

Our structural opening is just about that, but it's a relatively wide door going into a vaulted space so would really benefit going up an extra course.   Our trussed roof design has required a deeper rafter section than was originally assumed, so the wall plate has had to drop to maintain the ridge height which has in-turn squeezed the door height. 

 

Thanks for the inputs - I think we have a solution and have tweaked the truss design to extend the bottom chord to bear flat on the wall in the area above the doorway instead of a birdsmouth rafter.