Porch Roof to Mansard Roof

[TheEasterBunny]

Hi!
We are looking at putting an enclosed porch at the front of our house and I'm trying to understand the roofing options and process. I'd love an apex roof but wondering if a flat roof might be less interfering as we have a mansard roof. I've seen the below image. Our 1st floor walls are at a slight angle as opposed to this one that looks almost vertical. Would that cause an issue? What would be the process for attaching the porch to the roof? How do you stop damp/water coming from where they meet and where the new porch walls meet the current house?

 

[noseall]

Hi!
We are looking at putting an enclosed porch at the front of our house and I'm trying to understand the roofing options and process. I'd love an apex roof but wondering if a flat roof might be less interfering as we have a mansard roof. I've seen the below image. Our 1st floor walls are at a slight angle as opposed to this one that looks almost vertical. Would that cause an issue? What would be the process for attaching the porch to the roof? How do you stop damp/water coming from where they meet and where the new porch walls meet the current house?

Is that your house? If not, why not post a piccie of your own gaff, to give people an idea of what you're asking?

 

[TheEasterBunny]

Is that your house? If not, why not post a piccie of your own gaff, to give people an idea of what you're asking?

Sorry, it's not mine. It's a photo from Google. ours has some obvious defining features so I'd rather use already publicly available photos. I know that makes things difficult, I apologise.

It is a Cornish unit house, fully bricked up. I've attached a photo from Google of the exact construction and layout of ours.

 

[noseall]

Sorry, it's not mine. It's a photo from Google. ours has some obvious defining features so I'd rather use already publicly available photos. I know that makes things difficult, I apologise.

It is a Cornish unit house, fully bricked up. I've attached a photo from Google of the exact construction and layout of ours.

Awkward.

I'd go for a flattie, but it will still mean removing the bottom course of the tile hanging. Re-fixing them will be an issue.

 

[TheEasterBunny]

Awkward.

I'd go for a flattie, but it will still mean removing the bottom course of the tile hanging. Re-fixing them will be an issue.

Yeah, it is awkward. id have loved the extra roof space to make it feel bigger than it is.

How do you stop water ingress and damp. Is it the lead flashing between old and new roofs that does that?

 

[noseall]

How do you stop water ingress and damp. Is it the lead flashing between old and new roofs that does that?

Usually yes.

Yours is not an ideal junction to be weathering and will require some thought. The bottom course (tile hanging) will need securing or else they will fall off.

 

[Exedon]

As has been noted will require careful detailing but far from impossible.
I take it you intend a rosemary type tile?
Once flashed a 900mm round chimney that passed through a mansard roof so your proposed porch is a walk in the park!