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Old 11-13-2011, 02:56 AM   #1
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How many screws to mount a wall cabinet?


I have a wall cabinet that is 39"W x 42"H, and weighs around 100 pounds or so (without anything in it yet).

How many #10 x 2.5" zinc wood screws do I need to use to mount it securely to the wall? I'll be screwing into the studs, as long as I measured & marked correctly.

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Old 11-13-2011, 04:51 AM   #2
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How many screws to mount a wall cabinet?


6 to 8 will do it---every stud---two screws--one top and bottom

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Old 11-13-2011, 06:58 AM   #3
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How many screws to mount a wall cabinet?


Is the cabinet made of cast iron? Seems like a lot of weight for a cabinet. Make sure you screw through the reinforced portion of the cabinet.
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Old 11-13-2011, 07:24 AM   #4
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How many screws to mount a wall cabinet?


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Originally Posted by packer_rich View Post
Is the cabinet made of cast iron? Seems like a lot of weight for a cabinet.
That's what I was thinking too. If it weighs that much, I'd use around a dozen.... long screws.... into the studs...

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Old 11-13-2011, 09:56 AM   #5
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How many screws to mount a wall cabinet?


based on the weight either the cabinet is made of mdf or will be holding quite a bit of weight.
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Old 11-13-2011, 10:40 AM   #6
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How many screws to mount a wall cabinet?


weighs around 100 pounds or so (without anything in it yet). That might be lead reinforced MDF.
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Old 11-13-2011, 10:59 AM   #7
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How many screws to mount a wall cabinet?


Well, I was just guessing earlier, but actually I wasn't that far off:

Cabinet box: 47 lbs.
Maple doors: 9 lbs x (2) = 18 lbs.
Shelves: 8 lbs. x (3) = 24 lbs.

So, I figure that the cabinet comes in at somewhere around 89 lbs (empty).

The cabinet is 42" high. I don't know if that is unusual, and would explain the extra weight.

The sides and shelves appear to be a good quality MDF. The facings and doors are solid maple.

The maple is a pain in the a$$ to drill through, but it sure is gorgeous.

BTW, I only have 2 studs to mount on. They had 19" between the studs in this area of my laundry room, for some reason.

I've looked at the cabinets that are already in the house that were installed by the builder (by the same model/manufacturer). I may be missing something, but it looks like some of the cabinets are mounted with only 4 screws, even some of the 45" wide cabinets.

Maybe they have some of the screws behind some of the shelves? Or maybe 4 is enough?

Last edited by AzJazz; 11-13-2011 at 11:02 AM.
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Old 11-13-2011, 11:12 AM   #8
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How many screws to mount a wall cabinet?


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good quality MDF.
That seems to me an oxymoron. I hate that stuff.
(I like solid maple though. )

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Old 11-13-2011, 12:32 PM   #9
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How many screws to mount a wall cabinet?


If you look at the back of the cabinet from the outside, do you see any strips of wood? Usually 1x4. These will be the only place you can screw thru. If the back of the cabinet is solid MDF keep the screws near the top and bottom edges. Is there a reveal underneath at the rear where you could add an extra screw? That would add a safety measure.
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Old 11-13-2011, 12:53 PM   #10
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How many screws to mount a wall cabinet?


If it is a solid mdf cabinet you should have a 3" nailer on the top and bottom of the inside of the cabinet. Use 2 #8 3" screws on the top and 2 on the bottom to screw into the studs. Should hold just fine. Does it have a nailer?
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Old 11-13-2011, 02:08 PM   #11
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How many screws to mount a wall cabinet?


you can also use a french cleat to attach your cabinets to the wall.


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Old 11-13-2011, 09:36 PM   #12
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How many screws to mount a wall cabinet?


Quote:
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That seems to me an oxymoron. I hate that stuff.
(I like solid maple though. )

DM
I know. But, I've seen worse MDF that chips/crumbles easily. I change my statement from "good quality MDF" to "bearable quality MDF".

Quote:
Originally Posted by packer_rich View Post
If you look at the back of the cabinet from the outside, do you see any strips of wood? Usually 1x4. These will be the only place you can screw thru. If the back of the cabinet is solid MDF keep the screws near the top and bottom edges. Is there a reveal underneath at the rear where you could add an extra screw? That would add a safety measure.
The back of the cabinet was solid MDF. I followed your advice, and mounted the cabinet with a total of 6 screws in the two studs.

There was a slightly longer than 1" MDF surround on the top & bottom of the cabinet that was outside of the cabinet interior. I ran two screws through the back rail at the top. I then ran two screws near the top and two screws near the bottom inside the cabinet, using finishing (cup) washers to get more head surface area to hold the cabinet.

Definitely not a professional installation by me, but I'm definitely not a professional

That said, the cabinet is spot-on level, shimmed properly, and seems rock-solid. All I have left is to cut a couple of quarter-round trim pieces, and my first cabinet mounting will be complete.

I didn't make any mistakes or lose any blood this time, either.

Thanks guys!
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Old 11-14-2011, 02:49 PM   #13
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How many screws to mount a wall cabinet?


You don't mention if the cabinet is being mounted directly to the studs or through a wall covering like 1/2" sheetrock and then into the stud.
For that weight cabinet, I'd be installing blocking inside the wall so the 2 stud issue is moot.
Going through 1/2" sheetrock, I'd be using at least 6, 3" screws with a washer type head. Eight if the contents were also heavy.
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Old 11-14-2011, 08:58 PM   #14
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How many screws to mount a wall cabinet?


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You don't mention if the cabinet is being mounted directly to the studs or through a wall covering like 1/2" sheetrock and then into the stud.
For that weight cabinet, I'd be installing blocking inside the wall so the 2 stud issue is moot.
Going through 1/2" sheetrock, I'd be using at least 6, 3" screws with a washer type head. Eight if the contents were also heavy.
Thanks, Ron -

That's a very good point - I'm going through the sheetrock, so I guess I'll be buying some 3" washer-head screws. I don't expect the cabinet contents to be too heavy, so I'll just replace my 6 existing screws, one at a time.

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