Find rule for fixing window sill on new windows with wider trim

[CecEle]

I just had new windows installed that have wider trim than the older ones. This makes me suspect that the stud where the windowsill bracket was previously attached is now behind the trim. The marks visible in the picture are not from where the bracket was screwed in but where the actual support part rested against (the type of bracket).

What would you do? Attach the bracket through the trim or is there another obvious solution?

 

[Håbbe01]

If it is a wooden wall, there should be more studs, possibly vertical.

 

[CecEle]

If it's a wooden wall, there should be more studs, possibly vertical ones

It seems to be plasterboard and I have very amateurishly knocked on it to see if I can find studs but can only clearly identify the ones running vertically on the side of the window. However, the brackets need to be closer together, about 40-50 cm. They need to support a fairly heavy stone slab.

 

[Håbbe01]

Screw a stylish panel board over the studs you find. Then attach the brackets at any chosen distance.

 

[Bo arnold]

You have a horizontal beam that the window frame rests on, you may screw into it or into the window frame if needed. You may need to loosen the trim so you align it correctly and don’t end up in the gap between the frame and the beam. Just screwing into the trim without anything behind it will not hold.

 

[CecEle]

You have a horizontal joist that the window frame rests on, you can screw into it or into the window frame, possibly. You might have to remove the trim so you get it right and don't end up in the gap between the frame and joist. Just screwing into the trim without anything behind won't hold.

Yes, exactly. Where the trim is now is where the console was previously placed in the wall, so I'm pretty sure the horizontal joist is right underneath.

 

[CecEle]

Screw an attractive panel board over the studs you find. Then attach the brackets at any distance

Sounds like a convenient solution if it works! You mean I should attach the board to the vertical studs on the side of the window and then the board should hold up to mounting the brackets on? I assume the screw first goes through the board but then also into the drywall. Otherwise, a pretty thick board is needed. Or does the board need to match the length of the bracket screw?
Sorry for perhaps obvious questions for many - but not for me! I'm learning though

 

[Bo arnold]

This is how it looks at my place, I think you had a hole into the old frame. Hold the bracket close and drill into the molding and into the frame. If that doesn't work, you may need to lower the bracket to hit the stud. You can possibly prop it up with wooden blocks on the brackets to get the shelf at the right height. The suggestion with a board won't work with your brackets; for that, you would have to switch to a model with multiple screws on the wall.

 

[Håbbe01]

Seems like a smooth solution if it works! You mean that I would attach the board to the vertical studs on the side of the window and then the board should hold to put up the brackets on? Then I assume the screw first goes through the board but then also into the drywall. Otherwise, a rather thick board is needed. Or does the board need to match the bracket screw's length?
Sorry for maybe obvious questions for many - but not for me! Learning though

There are lots of other brackets that are screwed on with more smaller than one large.