Build your own garage - material and price list ok?

A. was it, as I suspected, that the available colors were not compatible with the desired ones? B. did you consider it appropriate to use flat panels (wall panels, possibly "double-clad") for garage roofs in order to move away from the thick profiling?

A: No, the colors would not be the problem. Manufacturers usually have 10-15 RAL colors in the standard range. Many of them in the gray range, such as RAL 7016, 7035, 9002, 9006, 9007, which are also common in house construction. For us, the sandwich panel itself is not approved as either a roof or wall element. :confused: B: For certain projects, it can indeed be useful in some cases to use wall panels for the roof. But only if an additional sealing membrane, such as under green roofs or sloped insulation with additional UV-resistant foil, is applied. The reason is that the closures, i.e. the joint from wall panel to wall panel, are unsuitable for standing water (which is "pressing" water on a roof).

Inside a building/hall, however, wall panels can be used again as roof panels, for example, if an office is installed afterwards and no water from above is to be expected and the roof is not going to be used as a storage area.

With dimensions of 6x7m, I would guess it is a double garage with space for a workbench in front of the parked car.

Depending on the version, that can already be seen. The parapet can only be provided on three sides, because an internal drainage with sandwich panels is only very complicated to implement. So "only" the suspended gutter remains, and from that side you can look onto the roof from some distance. Or other neighboring properties are slightly higher... neighbors from the upper floor...

Apparently, there are people who are supposed to be bothered by this view. Whoever wants to understand that :rolleyes: If the development plan allows the sandwich panels, then put them on the roof!

Okay, thanks. That’s no problem for us, the backside including the gutter faces the neighbor’s shed, not really visible and we don’t care anyway. Besides, I have seen that gray/anthracite etc. is offered everywhere, nicely neutral, no neon yellow :)

@Nemesis: are we actually talking about a single or double garage?

With the dimensions of 6x7m I would guess a double garage with space for a workbench in front of the parked car.

Exactly, a large garage (with a sectional door), no workbench but space for shelves etc. ;)

A different question: do you have to green the garage roofs?

No, nothing is prescribed. But we have already greened the flat roof of the house, so at least something has been balanced in this regard...

Can you still answer my question about the gate? Would be great, thanks.

Which (minimum) thickness of the panels do you recommend? I originally wanted to go for 60mm, or are 40mm enough? Cutting works without problems?

Which (minimum) thickness of the panels do you recommend? I actually wanted to go for 60mm, or is 40mm enough? Cutting works without problems?

That strongly depends on the span of the panels and whether the roof should remain walkable. With a rafter spacing of 70cm or 100cm, the 40mm panel also holds, but I personally would probably go for at least 60mm thickness. Without wanting to be nailed down on this and only considering snow load + 100kg for one person, they also span up to 2.40m. A structural engineer should definitely check that again briefly. Cutting is done with a jigsaw or circular saw, apparently quite easy, but I have never had the chance to try it myself ;) Normally, you only have to cut one panel to the full length, depending on how the panels are laid out. In terms of length, I would order them fixed straight away, i.e. the actual required measurement.

However, due to the work, I always tend to go for the larger profiles; with us, a 100mm core thickness almost always results in the structural calculation, though also with spans over 2.50m.

It strongly depends on the span of the panels and whether the roof should remain walkable. With a rafter spacing of 70cm or 100cm, the 40mm panel also holds, but I would personally probably go for at least 60mm thickness. Without wanting to be pinned down on this and only considering snow load + 100kg for a person, they also span up to 2.40m. The structural engineer should definitely check this briefly. Cutting is done with a jigsaw or circular saw, which is quite easy, but I have never been allowed to try it myself ;) Normally, you only have one panel cut to the full length, depending on how the panels are arranged. For the length, I would order them fixed to the exact required dimension.

Through my work, however, I tend to the larger profiles; with us, a 100mm core thickness almost always comes out in the statics, even for spans over 2.50m.

The problem is that the suppliers I have found so far do not implement custom cuts for my needs (about 42sqm). Stock goods are no problem, but I would have to shorten each panel a few cm in length and also cut the last panel sideways. Most offer panels with a width of 1 meter. With a rafter spacing of about 70cm, the span is thus rather not the problem, but I still tend towards 60mm.

I am facing exactly the same situation and have a similar calculation. However, we are actually using the 17.5 cm stones because of the greater internal width. I still have the following questions: - from which provider do you get the gate including installation? Or does someone else do the installation? - we were advised to have a rafter spacing of about 70 cm due to the statics; are your 100 cm based on statics or just a guess or something else? - can you and/or others tell me more about the advantages and disadvantages of these sandwich panels? We also want a flat or slightly pitched roof and have already tried several variations for the roof structure without being really sure... Thanks and greetings

Sorry, somehow the email notification didn’t work and I thought no one comments here anymore. - The provider was a local partner of the market leader with the yellow H. - I estimated the rafter spacing; no statics are available yet. A colleague, for example, built her garage with similar dimensions and only three huge glued laminated timbers were used there. - The advantages were already mentioned here. The sandwich panels will also be used on the carport in case the garage doesn’t work out. But this is more about sound absorption during rain, as our bedroom is directly next door. Could you please publish your calculation or send it to me?

Could you please publish your calculation or send it to me?

For us it looks roughly (!) like this:

Calculation Garage
Type	Quantity	Price
Foundation	1	existing
Ytong 17.5 blocks	49sqm	1800
Ytong U-blocks*	44 pieces	580*
Ytong thin-bed mortar	115kg	120
Concrete	1cbm	300
Sectional door	1	2500
Door installation?	1	1000
Roof rafters	9	1500
Attic flashing sheet	26m	750
Sandwich panels	7	2000
Gutter + downpipe	1	150
Statics	1	existing
Door	1	250
Window	1	100
*alternatively simple formwork
SUM		11050

Our go-to handyman suggests to do without the U-blocks and simply solve it with formwork. In addition, we are considering installing the door ourselves, but I am still unsure about that...