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3cmm granite top on plywood kitchen cabinets

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Forum topic by Vjeko posted 02-16-2009 11:01 PM 3550 views 0 times favorited 13 replies Add to Favorites Watch
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Vjeko

135 posts in 2879 days


02-16-2009 11:01 PM

Topic tags/keywords: question

I’m planning on building euro style kitchen cabinets out of 3/4” plywood,
edgebanding of sides with hardwood (I will use full tops and backs except for
the sink + dishwasher just sits between two cabinets) .
The cabinets will be 60cm to 90 cm wide and <60cm deep.

Is it necessary to strengthen these cabinets in anyway because of the
granite/ any changes to what is edgebanded ?

-- Vjeko Balas - Croatia


13 replies so far

View childress's profile

childress

841 posts in 3007 days


#1 posted 02-16-2009 11:31 PM

not really…should be good to go

-- Childress Woodworks

View Gene Howe's profile

Gene Howe

8254 posts in 2893 days


#2 posted 02-17-2009 12:24 AM

Cabinets will be plenty strong enough. Use 5/8 ply and 1/4 cement board under the granite. DO NOT apply mastic directly to the ply!

-- Gene 'The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.' G. K. Chesterton

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Vjeko

135 posts in 2879 days


#3 posted 02-17-2009 12:44 AM

You’ve lost me – I’m in Croatia and am not sure what is cement board (I do vaguely remember
something called cement sheet when I used to live in Australia – put on wood/walls where
eg tiles are to be applied i.e. wet areas) – haven’t seen it around here / any alternative
(I think majority of kitchens are melamine covered chipboard here).

BTW if I understand you right, the cement board goes on top of the top ply ,
underneath the granite, it will be visible from the front / how is that solved ?

-- Vjeko Balas - Croatia

View Francisco Luna's profile

Francisco Luna

939 posts in 2858 days


#4 posted 02-17-2009 12:57 AM

When installing the cabinets, for sure they are going to be secured against the wall with more screws between cases…...so all the system will be sturdy enough to support the granite weight.

I have never installed Granite, but I have seen the contractors make a bullnose at the edges to hide the plywood and other “fillers” underneath.

-- Nature is my manifestation of God. I go to nature every day for inspiration in the day's work. I follow in building the principles which nature has used in its domain" Frank Lloyd Wright

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marcb

768 posts in 3138 days


#5 posted 02-17-2009 01:08 AM

Vjeko,

If you don’t have cement board try to find floor leveling cement. Used for floor tile, poor, let level, dry, apply adhesive.

View Gene Howe's profile

Gene Howe

8254 posts in 2893 days


#6 posted 02-17-2009 02:55 AM

Vjeko, You are correct about the terminology…US Cement board=AU Cement sheet.

Marcb has a good solution in the absence of the cement board. However, you must insure that the leveling cement is very level as it dries. Also, it might be a good idea to apply some polyurethane to the ply before the leveling cement in order to stop wicking and/or delaminating the ply. I’d use 3/4 ply for this application.

As far as the edge is concerned, you can either have a bull nose applied to the granite (or buy bull nosed slabs) or cut strips of granite and apply them to the edge. Whether you cover the granite edge or slip the strip up under the granite overhang is a matter of taste and how you lay the granite on the top. I’ve done it both ways. Usually, a good silicone adhesive and tape “clamps” will suffice to hold the edge. I also use the adhesive for the back splash, on occasion. Depends on the customer’s design choices.
Good luck

-- Gene 'The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.' G. K. Chesterton

View tenontim's profile

tenontim

2131 posts in 3209 days


#7 posted 02-17-2009 03:15 AM

I just had quartz counter tops installed and I was concerned that the 3/4 cabinet grade plywood I used for the tops would be strong enough. The installer told me it would be strong enough for granite. Granite is usually cut thicker than the quartz, and will support itself over a broader area than quartz. The main thing with granite is the weight, so don’t build light weight cabinets, or put it in a mobile home.

View FEDSAWDAVE's profile

FEDSAWDAVE

293 posts in 2897 days


#8 posted 02-17-2009 03:29 AM

Whatever you do with that granite….make sure you seal it !

www.tools4granite.com

-- David, Tools4solidsurface.com

View Vjeko's profile

Vjeko

135 posts in 2879 days


#9 posted 02-17-2009 11:24 AM

Thanks for all the info/tips – I will check out what is available.

One connected question regarding cabinets being screwed together for strength :
I have a dishwasher coming in between two sets of cabinets and it just sits
there between them – as far as I understand there will be nothing but the
granite/counter top “joining”/covering the two sets of cabinets – or are they usually
joined in some way for stability (or each set screwed to the wall separately and that’s all) ?

-- Vjeko Balas - Croatia

View Gene Howe's profile

Gene Howe

8254 posts in 2893 days


#10 posted 02-17-2009 04:41 PM

Screwing them to the wall AND that piece of 3/4 across the top will be plenty of strength. Those cabinets won’t move.

-- Gene 'The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.' G. K. Chesterton

View irishcolleen's profile

irishcolleen

66 posts in 2946 days


#11 posted 02-17-2009 07:13 PM

I think the point doubthead was making was:
beside screwing the cabinets to the wall in the back, they are generally screwed together at the adjoining sides, so there is no gap left between them. You don’t have to worry about joining them to the dishwasher.

View Vjeko's profile

Vjeko

135 posts in 2879 days


#12 posted 02-17-2009 08:45 PM

The problem I saw was in the fact that the height of the dishwasher is such that with the present design it will just fit under the benchtop without plywood on top i.e. the cabinets on each side of the dishwasher are not adjoining to anything. I will therefore need to alter the overall design height to incorporate the plywood over the top of the dishwasher and add plywood sides to support it and the granite above.

I think I’ll have to start using sketchup – the small problems sometimes become invisible in my description
perhaps because they seem so obvious to me ;)

-- Vjeko Balas - Croatia

View Ronny's profile

Ronny

10 posts in 2851 days


#13 posted 02-18-2009 01:43 PM

Hi Vjeko
I build several Kitchen already and installed the Granite on it with just 2 cm thick Granite.
There is no need for add Plywood. We are using here a resin mixed with grout to glue the Granite to the Cabinet and wall. and also the gap between the Granit. Use the color of the grout that match your granit.

there is no need for Sketch up. there is a free Tool specialy for Kitchen. with standard Kitchen Cabinet. look on www.ikea.de.

-- Ronny Lechner, Cebu Philippines

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