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Topic:   Threshold over ledger support - 618 visits (1 today, 1 this week)

Larry Dickerson
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From:St. Louis, Missouri
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posted March 23, 2007 09:53 AM            

How far can a threshold extend past the ledger support? This one was 1 1/4"?
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Jerry Peck
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From:Ormond Beach, Florida
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posted March 23, 2007 10:07 PM            

I'd say about flush with the edge. It's needed for support.

Install a piece of pt for support under that, or something else which will support the threshold *&* help stop water. If using a piece of pt, the pt will need to be sealed behind and above - just like if the threshold were installed on a flat floor to the edge of it.

Just as important, and maybe even more important, than support is water intrusion resistance.

Thom Walker
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From:Corpus Christi, Texas
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posted March 24, 2007 07:59 PM            

And to avoid being a toe catcher.

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Loyalty to petrified opinion never broke a chain or freed a human soul.

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wayne soper
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From:norwalk
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posted March 25, 2007 05:53 AM            

As with any protrusion that is affected by rain it requires a drip edge to direct water away from wood below it. 3/4 of an inch is normal and does not affect the stability. Going flush will allow water to run under and cause decay.

Jerry Peck
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posted March 25, 2007 02:40 PM            

"As with any protrusion that is affected by rain it requires a drip edge to direct water away from wood below it. 3/4 of an inch is normal and does not affect the stability."

Except that thresholds 'are designed to be supported along that front edge. I.e., that front edge *is not* designed to have any overhang.

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Jerry Peck
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(i.e., Daytona Beach area)

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wayne soper
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posted March 25, 2007 04:33 PM            

Jeryy, do mean this type, an aluminum threshold, or wood too. Because you know water is going into the joint if its flush.
A wood threshold actually has a groove cut in it about 1/2 to 3/4 back from the nose as a drip edge. They do up here anyway. Wayne

Jerry Peck
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posted March 25, 2007 08:08 PM            

"Jeryy, do mean this type, an aluminum threshold, or wood too. Because you know water is going into the joint if its flush.
A wood threshold actually has a groove cut in it about 1/2 to 3/4 back from the nose as a drip edge. They do up here anyway."

Both.

The metal ones are designed to set on the slab or floor, be sealed to the slab or floor (most, if not all have vinyl weatherstrip ribs which are pinched down when the threshold is secured in place.

The wood ones I've seem, all of them, have "grooves", not "groove", cut into the bottom of them. These grooves are to help the threshold resist warping. Just like you find on the back side of a wood door jamb.

I've seen some wood ones with vinyl weatherstrips which slide into special grooves, but some are just sealed (caulked) under - full bed or two or three longitudinal beads of caulk, not a snake bead, those leak for sure - and secured down to keep the sealant doing its job.

I've never seen a wood one made with an overhanging edge. I can just that that overhanging edge splitting off the first time something heavy is brought in over it, or the first time a person step on the edges ... CRACK! ... it's now hanging loose with split grain.

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Jerry Peck
Ormond Beach
(i.e., Daytona Beach area)

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