building extension - sloping roof detail to angled end wall

[Wayne B]

Hi, and thank you for allowing me into the Hub.

 

I am currently drawing up plans for an extension to the rear of my house.  The extension is currently rectangular and short of the right side end of the house as the neighbours boundary is angled.  As I am losing some space I was thinking about angling my new extension wall to suit the angle.  My quandary is that my tiled roof is sloping down but if the right side wall is angled then how do I treat the rain fall off the roof.  Do I take the right hand wall higher and then lead flash the roof tiles or would I be better having a ridge on the sloping eaves on the side?  Is there another alternative? Wondering which is best method/good practice.  I would appreciate any help.

 

I have attached a PDF of the outline drawing.  This shows the rectangular extension, the neighbour's boundary to the right and a red dashed line to show the angled wall that I could use

 

 

 

 

Roof detail.pdf

[JFDIY]

Hi and welcome.

 

Depends if you can really use the space it creates? - will it add to the room or detract?.

 

If its brickwork finish, you might make that corner awkward/expensive if you have to get bricks cut and bonded. 

 

 

I've seen roofs where they would just put a facia on that, easier with plain tiles as you can raise that edge to encourage water to stay on the roof, might be a bit of a pain on large format interlocking to do.

you could 'hip' the last part and incorporate the change in angle and maintain a gutter.

 

 

 

[Wayne B]

40 minutes ago, JFDIY said:

Hi and welcome.

 

Depends if you can really use the space it creates? - will it add to the room or detract?.

 

If its brickwork finish, you might make that corner awkward/expensive if you have to get bricks cut and bonded. 

 

 

I've seen roofs where they would just put a facia on that, easier with plain tiles as you can raise that edge to encourage water to stay on the roof, might be a bit of a pain on large format interlocking to do.

you could 'hip' the last part and incorporate the change in angle and maintain a gutter.

 

 

 

Thank you for this information.  I had not considered the increase in cost for the angled brick work and it is a good point.  The external space in its current format creates a bin store area.

 

 

[Temp]

Another possibility is to step the wall out instead of making it angled. 

[Carrerahill]

1 hour ago, Wayne B said:

Hi, and thank you for allowing me into the Hub.

 

I am currently drawing up plans for an extension to the rear of my house.  The extension is currently rectangular and short of the right side end of the house as the neighbours boundary is angled.  As I am losing some space I was thinking about angling my new extension wall to suit the angle.  My quandary is that my tiled roof is sloping down but if the right side wall is angled then how do I treat the rain fall off the roof.  Do I take the right hand wall higher and then lead flash the roof tiles or would I be better having a ridge on the sloping eaves on the side?  Is there another alternative? Wondering which is best method/good practice.  I would appreciate any help.

 

I have attached a PDF of the outline drawing.  This shows the rectangular extension, the neighbour's boundary to the right and a red dashed line to show the angled wall that I could use

 

 

 

 

Roof detail.pdf 61.03 kB · 4 downloads

What do you gain at the widest point? 900mm? - less if you take into account the fabric of the wall.

 

You need to work out if it is worth the additional headaches and costs associated not to mention all the difficulties it creates, you will need to order more carpet for the diagonal end only to bin a large piece, or you will need to cut every piece of laminate/wood floor at an angle which means you then need to cut it straight to then use the off-cut at the opposite end for the next run, so more waste there. 

 

As for the roof, you will nor be able to use a standard verge detail and a gutter would look stupid to try and catch the rain water so really you would need to just to a angled wet-verge or something. 

 

The only way I would contemplate it would be to have a hipped roof at that end, but that adds extra work and cost. 

 

I think I'd just leave it as it is frankly. 

 

I would be thinking about more windows. 

Edited April 30, 2020 by Carrerahill

[DevilDamo]

I’ve recently been involved something similar and convinced the client to run the new wall perpendicular with his rear wall as opposed to parallel with the neighbours’ garage wall, as attached.

[Wayne B]

On 30/04/2020 at 15:32, Carrerahill said:

What do you gain at the widest point? 900mm? - less if you take into account the fabric of the wall.

 

You need to work out if it is worth the additional headaches and costs associated not to mention all the difficulties it creates, you will need to order more carpet for the diagonal end only to bin a large piece, or you will need to cut every piece of laminate/wood floor at an angle which means you then need to cut it straight to then use the off-cut at the opposite end for the next run, so more waste there. 

 

As for the roof, you will nor be able to use a standard verge detail and a gutter would look stupid to try and catch the rain water so really you would need to just to a angled wet-verge or something. 

 

The only way I would contemplate it would be to have a hipped roof at that end, but that adds extra work and cost. 

 

I think I'd just leave it as it is frankly. 

 

I would be thinking about more windows. 

Many thanks for your comments.  The internal elements do not worry me too much as I would be carrying out those tasks.  I note your comments about roof though.

[Wayne B]

On 30/04/2020 at 20:14, DevilDamo said:

I’ve recently been involved something similar and convinced the client to run the new wall perpendicular with his rear wall as opposed to parallel with the neighbours’ garage wall, as attached.

Looks good, many  thanks.