What are the approximate additional costs with a lower roof pitch?

Hello everyone,

According to the development plan, our roof (shed roof) must have a minimum pitch of 15°. We didn’t want more than that, but the architect said 18° is the minimum that works. Now, during the sampling, suddenly there is talk of 22°. That is, of course, a lot. We were told that with a special clay tile, we would reach 18°.

I did some research myself. Our normal roof tiles would be the Braas "Harzer Pfanne". They are designed for a standard roof pitch of 22°. Below that, the subroof would probably have to be sealed more tightly. Can someone tell me roughly how much more such a thing costs for a base area of 9m x 10m? With the developer, I always wait many days/weeks for such information.

The developer also saves money because with a flatter roof he has slightly less roof area and also fewer Poroton bricks and plaster. I wanted to argue that additionally. Even for extending the roof overhang from 30cm to 50cm, 2250,- is due. I also find that a lot for just a few centimeters.

Best regards and Merry Christmas

How much is he supposed to save?

Without calculating it now, I’d guess one or maybe two rows of roof tiles.

We also faced the question of whether we wanted a flat shed roof.

An acquaintance of ours (master roofer) said quite generally: Better a well-executed flat roof than a too-flat shed roof.

The problem, as you yourself have recognized, is the fact that roof tiles eventually stop being watertight.

I know houses that don’t have any waterproof underlay beneath the tiles and are still dry. Then you have to use special tiles that remain watertight. Or seal it expensively.

Long story short: She strongly advised us against the idea.

Hello,

According to the development plan, our roof (shed roof) must have a minimum pitch of 15°.
We didn't want more than that either, the architect said, however, 18° is the minimum that works.
Now, during the sample selection, suddenly there is talk of 22°. That is obviously quite a lot.

I don't understand that; sorry. In the development plan, or the textual stipulations of the development plan, it must state which pitch is allowed for the shed roof, right? So where does the jump from 18° to 22° come from? And what pitch does the building permit specify?

Roughly estimated, you can expect costs of about €1,500.00 per degree/pitch.

Rhine greetings

I think it's less about the development plan. According to the OP, it requires a slope of at least 15°. So whether 15, 18, 22 or even more. The architect (or whoever) apparently wanted to do 18° at the customer's request, but now finds that the price only includes tiles suitable from 22°. Other 18 tiles apparently cost extra. That's how I understood him.

Even for the extension of the roof overhang from 30cm to 50cm, 2250,- is due. I also find that a lot for just a few centimeters.

It's not just more roof tiles, also more wood is used and possibly one more row of cross battens is added (I don't know the technical term for the horizontal beams). Additionally, 20 cm more sub-sheathing.

Merry Christmas

Even if we say now, for example, that costs 5000 euros more, your developer can still make 10,000 euros from it to do business. I would go for a 24-degree pitch to have some buffer to the limit so that there are no problems even in 30 years. But well, maybe you value the appearance more... It doesn't play a big role for me as long as the lady is satisfied.