What kind of roof , when replacing the flat roof on garage with pitched roof.

lokz

Hello all,

As part of our internal garage conversion, I am planning to replace the flat roof  of the garage with a pitched roof ( i know it triggers the planning application). I am also planning to add a open brick porch and have a common roof to the porch and the garage. The total external area would be 9 sq m ( 3.5 * 2 - for the garage, 1.5 *2 for the porch) The drawings and the layout of the house can be seen below.

when I have been looking around the neighbourhood, I have seen different kinds of roof as below.

I am planning to have a open porch with proper footings as in the right image below.

As in the left image below, there are 2 kinds of roof, what kind of roof is preferred . ( 2 reasons why i wanted to convert the roof is for longevity and higher space inside the garage ) . Thanks.

Doozergirl

They're both tiled roofs.  One is hipped, one is gabled but it makes no difference to longevity, they'll both outlast you. 

What is relevant is the angle of the pitch of the roof and whether it is steep enough to accommodate the tiles that match your main roof.   There won't be much of a fall, given the proximity of the upstairs window.  

Time to employ Pythagoras' theorem.  

stuart45

Pythagoras or an online calculator. There's about 1 metre of brickwork between the garage roof and the cills, so 2x1 gives a 27° pitch, but it will be less than that to get the tiles and flashing under.
A hipped roof probably won't suit the look of the house so well. 

ThisIsWeird

The main difference between these two examples and yours would appear to be that your garage wall is in line with your house side, and doesn't step out further like the examples. I therefore think the hipped roof would be a far more complex option, for little visual gain. And any visual gain would be a matter of opinion anyway, tho' I do personally prefer it between these two styles.
So, a gabled roof would seem to be the most obvious choice, and while it may not be able to equal the angle of the existing house roof, I doubt the difference would be obvious when looking at and approaching the house? I mean, look at the gabled example in your picture, and it's clear the garage roof is at the same angle as the house's, as you can compare them along the house side, but without that visual guide - with only the front slope to look at - the angles look, and could be, different?
Keep looking for other examples, especially ones with their garages flush with the house at the side.
As well as providing more headroom and feeling of internal space, it should transform the street view too, so very worthwhile, I think.
Will the inside be 'vaulted'? If so, thinking of adding a skylight?

lokz

Thanks Every one. I have measured and the height is just above 1 meter which gives a pitch of about 27degrees. I think something similar to below should be ideal for my house.

I was considering having roof light windows as well (with vaulted roof). will that be achievable with that kind of pitch . Not sure if it is a good addition or bad addition for that size of roof ( 4.5 * 2 ). I mean in terms of strength and longevity of the roof.

stuart45

The pitch will be less than 27°, more like 22° to get the battens, tiles and flashing in. It's still enough for pantiles and a standard velux or 2.