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Floating Mullion Question

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Forum topic by GaryCK posted 10-07-2020 12:37 AM 329 views 0 times favorited 5 replies Add to Favorites Watch
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GaryCK

132 posts in 1259 days


10-07-2020 12:37 AM

How much clearance should I leave between the top and bottom of a floating mullion and the maple face frame of a cabinet? I’ve never built a floating mullion before and don’t currently have a cabinet that includes one to check as a reference. Thank you in advance. Gary

-- Gary, Wisconsin


5 replies so far

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Sycamoray

95 posts in 450 days


#1 posted 10-08-2020 08:07 PM

I’m not sure I understand the question. Are you trying to leave a gap between the mullion and the show surface (front) of the head or transom? Or are you trying leave a gap between the top of the mullion and the inside of the head or transom?

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GaryCK

132 posts in 1259 days


#2 posted 10-09-2020 12:10 AM

I figure that the floating mullion cannot be the exact same width as the opening between the top and bottom of the face frame. I’m considering what gap I should leave vertically between the top of the mullion attached to one door and the bottom of the top face frame and from the bottom of the mullion to the top of the bottom face frame.

Thank you.

-- Gary, Wisconsin

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drsurfrat

971 posts in 396 days


#3 posted 10-09-2020 01:06 AM

I think I worked through your words (a pic or sketch always helps). I think it should be zero. The grain of the mullion and vertical side frame all match? Yes – then they will all move together in terms of seasonal changes. Any gap will allow your horizontal face frame parts to bow and mess with your door fit.

I admit, I might be completely misunderstanding your issue.

-- Mike (near Boston) ... Laziness is the mother of invention, necessity is the mother of exhaustion - me

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Sycamoray

95 posts in 450 days


#4 posted 10-12-2020 03:20 PM

Thanks, Gary. I think I now understand what you’re asking.

Assuming a non-film finish, I would advocate a gap of around 1/32”. If you hit a perfect zero gap, the mullion will rub against the head. If you’re going to finish with paint, poly, or some other film finish, I’d try to factor in the thickness of the coats you’ll be applying. Otherwise, the mullion will rub the finish right off the head and vice versa.

Many folks who make floating mullions place it outside the plane of the face frame. It then has a complete overlap with the head on that side. On the inside, they just match the measurement of the reveal around each sash.

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GaryCK

132 posts in 1259 days


#5 posted 10-12-2020 11:14 PM

Thanks everyone for your input. I initially decided to leave 1/16” at the top and bottom, but ultimately decided that I had enough room to move the hinge holes in the face frame inward to close the gap and eliminate the mullion altogether. I just got the doors assembled to the face frame last night and plan to finish them up tonight.

Thanks again.

-- Gary, Wisconsin

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