How to flash a ledger for a pergola

Little Pantz , Tuesday, 17th of August 2010 05:47:28 PM

Hi, I am building a pergola that will be attached to the house. The house

Little Pantz

is brick up until about 10 feet, then its vinyl siding up to the roof. The

Registered User

ledger (2 x 8 x 12 feet) is going to be fastened to the house where the

Joined: Wednesday, 2nd of June 2010, 21:37:56

brick meets the siding, so that the board is surrounded by the siding on 3

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sides and brick on the bottom side. l plan on cutting away the vinyl siding

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and using countersunk lag bolts to secure the board to the studs behind the
siding.
So my question is--how do l flash the ledger and make sure l
can waterproof this thing?
1. Should l squirt some silicone right
into the pre-drilled holes in the studs for the lag bolts?
2. Should
l leave a gap (with washers) between the ledger and the house?
3.
When l flash the ledger, how much of the flashing do l bend over the top
of the ledger--does it need wrap all the way over board, like in a
Z-pattern (which l think will look ugly) or can l just get away with a
90°, like an L-pattern? And how to l attach it--nails?
And
finally,
4. Do l need to use J-channel and how the heck do l use
it?

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Industrial Barbie , Wednesday, 18th of August 2010 09:39:54 PM

They make a rubberized flashing that is backed with tar for

Industrial Barbie

windows. I would take this & flash between the board & the j-channel. The

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idea is to funnel the water away from areas you do not want it. So take

Joined: Saturday, 15th of May 2010, 16:30:16

down siding.(Will probably have to remove the piece above & to the sides

Posts: 2015

as well. There is probably a j-channel sitting on the brick. This you will

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want to move as well. Place ur board up there & trace the outside edge.
Your rubber window flasing will sit half on one side of line the other on
the other side. I would then bend a piece of alum. trim that will fit
behind ur ledger come across ur brick & barley hang over the face of the
brick. This is installed with small panel nails or trim nails. Put ur
first piece of rubber flashing over edge of the alum. trim placing it
horizontal or length ways. Continue moving up, over lapping the next at
least 2'' & will probably want it 8'' extra long on each end to go under
the siding. Do this until you go over ur line you drew. Put board up with
lag bolts against wall. Take j-channel & outline ur board with it. In the
corners if you experiment with cutting you will see that you can turn a
corner & have overlaps that will still contain the water. Reinstall siding
& make sure it moves freely. Water coming down the siding will enter the
j-channel & be swept away. Small cracks between ur ledger & J will be
waterproof with the flashing behind it. If it gets back there then it can
exit at the bottom over the alumin. drip edge. Go to VSI webpage & order an
installation manual. Think it is 5 bucks. Will not help with the ledger
but will help with cutting the j, flashing techniques, bending techniques,
& siding installation. May be an easier way but I think this will keep you
in the dry.Hope it helps.

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How to flash a ledger for a pergola

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