How to mount a heavy rangehood?

[Buuzaster]

Hi there, 

I'm desperate for some advice and help please! 

We are replacing our old rangehood with a heavier, higher performer about 35kg. Our house is steel frame with 2 vertical stud far apart, so the original workaround was our builder has installed thin metal sheet nogging "partially" covering the area. 

 

The old unit is pretty light weight about only 10-15kg but this new unit is a monster. 

We should be able to get 1-2 screws to metal sheet nogging but some just on hollow plasterwall. 

To add to the level of difficulty, we have just freshly tiled the entire kitchen splashback. Total thickness plasterboard 12mm + tile 13mm. So unfortunately there's no real option to cut through the wall to add more nogging. (I'm crying my eyes out)

 

So my questions are:

- what will be the best heavy duty anchors to use for metal sheet nogging? 

- what will be the best heavy duty anchors to use for hollow plasterwall? 

- will it be okay to hang something so heavy partially on noggin and partially on hollow wall? 

Thank you heaps!! 

[EricL]

Hello @Buuzaster 

Welcome to the Bunnings Workshop community. It's sensational to have you join us and thanks for sharing your question about mounting your rangehood.

It's too bad that your builder did not suggest building a timber frame inside the steel stud to carry the weight of the rangehood. Now that the wall has been tiled there won't be an opportunity to put in that support piece. Just to give you an idea of how heavy 35kg is, it is equivalent to 2 medium sized toilet suites. 

I propose looking at the Tox M6 Flip Toggle Bolt to be used on the steel stud. You could technically use the same toggles on the tiled wall, but I suggest anchoring the rangehood to the cabinet that is next to it. This is on the condition that there is a cabinet next to your rangehood. I also recommend speaking to your builder in regards to anchoring your rangehood to your steel stud wall as 35kg is a lot of weight and the steel stud might have a load limit to it.  

Let me call on our experienced members @Nailbag and @Dave-1 for their recommendations.

If you have any other questions we can help with, please let us know.

Eric

[Buuzaster]

Hi Eric

Thank you for getting back to me so quickly. 

Unfortunately the house has now handed over, our builder is off the hook. But I will definitely find out how heavy can that metal sheet nogging support. 

And there won't be any cabinetry work next to the rangehood, if you look in the photo the rangehood will be directly above the cooktop on a fully tiled wall.

Just wondering if there's any other option to add support external to the wall but at the same time not ruin the look of the splashback? 

35kg seemed a look, 2 toilet suites  wow! 

[Nailbag]

Hi @Buuzaster 

I have a couple of thoughts but need a photo please of the Rangehood. Or better still the brand and model number. 

It’s not just the fixing to the wall but how to support the weight during marking out and installation. 

Nailbag

[Buuzaster]

Hi Nailbag

Thank you for your response. 

It's not a Bunning's brand, I hope it's still okay.

The spec sheet is as below:

 

 

[Nailbag]

Thanks for sending these through @Buuzaster .

You will need to support the hood off the benchtop in exactly the right position and height. A strong timber grate with wedges you can tap in from the side will work or consider winbags for a more precise adjustment.

You will need to position the hood to mark the fastener holes, then remove it to prepare them. The toggle bolts for the metal studs @EricL recommends will be perfect. Then to fix through the tiles I would suggest Ramset Multipurpose fasteners.  Each mounting post has a 32kgs support strength.

Though this should be ample to supportive weight, you could also consider installing a right angled aluminium strip across the bottom.

Nailbag

[Buuzaster]

Hi Nailbag 

Thank you for your response again! 

Definitely a lifesaver, I have been losing sleeps, worried that I will need to break the newly laid tiles. 

Is it possible for you to explain the first bit a little more? I'm very new to this, I don't quite understand what a timber grate with wedge is and where that should be placed? 

With Ramsey multipurpose fastener - on the package the load rating for plasterwall was only 11kg and 32kg for concrete? Is there anything more heavy duty that you would recommend? 

The last bit, I think I get it! Mount metal angled strip wall and screw to the bottom of rangehood?

[Dave-1]

Good Evening @Buuzaster 

Mmm and outside the box but inside the box problem..

What sort of lining is on the external wall? 

Do the support holes for the hood line up with your studs at all?

Having a thinking about the issue, I just went to https://www.robamworld.com/uploads/679f3f4f.pdf

There seems to be a defininite rule about the location and size of the vent which then reflects on how the hood is secured. 

It comes down to where the oven is, then the hood over the top but that has a set of rules of how the flue is exausted which denotes the location of the foot of the hood. 

One way you could support the "hood" if nothing lines up is to install a solid metal splashback for the hood itself, this is so it covers the studs that you have within the wall (I know metal stud walls have different load bearing then timber ones) With the weight distributed via the metal splashback (for a better word) you only need to worry about how to connect the footing for the hood to the metal sheet.

Dave

[Buuzaster]

Hi Dave 

Thank you for your response. 

Our house is steel frame brick veneer, we already had prework completed for ducted pipe by the professional according to Robam's requirement. 

So our real challenge is hanging the hood/ machine part of the rangehood really. The other bit has already sorted.

With metal sheeting splashback, do you mean to put on top of the tiles covering the entire width of the 2 metal studs, then mount hood to the metal splashback? The studs (as per my previous photo) they are very far apart and not centred (our builder was supposed to install a full size steel plate across the area, not a short one like what we had). Or do you mean just to add metal sheet behind the back of the rangehood - but by doing that it's not fixed to studs (but a good change that it's fixed to steel plate that was fixed to the 2 studs)

[EricL]

Hi @Buuzaster 

Let me tag @Dave-1 to make them aware of your response.

Eric