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optimistic
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# Posted: 1 May 2013 09:00pm
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I have a 12'x12' shell (prefeb shed) with wood siding. I finished the floors and the lofted bed space.
I want to install a 30x60 double hung window. I currently have a treated wood siding (similar to T1-11). I want to eventually get live edge boards and install it over the siding. I obviously want to have Tyvek under the live edge boards which connects to the window - should I put some tyvek on now and flash the opening?
The problem with doing that is that Tyvek can be exposed to UV for 3-6 months but I will not get to the live edge boards in time....
Any advice?
Also, if someone give explain in general how to flash (not sure if that is the right lingo... I mean to seal it from water) a window in simple wood framing?
Thanks!
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WY_mark
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# Posted: 1 May 2013 09:05pm
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google "how to flash a window"
the biggest problems in building come from improper building envelopes, the layer order of things in installing your window is very important. since you've already got siding you may want to look more for a tutorial on installing a window in an existing wall.
there are a number of easy to use adhesive roll products. if you're only putting in one window the trim really takes no time, why not just do it all and be done? your siding comes up to (not over) the trim anyway, do that later and when it's time you can pop off the trim, put tyvek under and replace the trim.
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optimistic
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# Posted: 1 May 2013 09:19pm
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I like your idea but from what I seen, even in your link, it won't work unless I didn't understand your idea.
They always flash with the flaxible roll OVER the wrap which means that I need to have wrap down... I am not supposed to glue the roll onto the sheathing but onto the wrap.. Right?
Am I missing anything?
I don't mind doing the trim and then poping it off - if that can be done.
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optimistic
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# Posted: 1 May 2013 09:41pm
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Watched a few more videos... Some attach the flashing roll to the wood and then the wrap over it while others to it the other way... If I can connect it to the wood then just put a trip around it - that will be great.
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ICC
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# Posted: 1 May 2013 10:13pm - Edited by: ICC
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The FHB article is a good one, but it does not cover your exact situation because for whatever the reasons you want to install the window before the wrap and new finish siding. You can make this work though..
If I understand you have a sheet siding similar to T1-11 that is nailed directly to the studs. If you want to install the window now and do the new siding at some unknown later date this is how I would do it. Assuming the window has fins.
Measure twice and cut the opening out to the RO measurements for your window.
Frame the opening, header, jack studs, sill, cripples, the whole ball o' wax. Apply flashing like self adhesive Vycor Plus. Work from the bottom up, always. If water gets in there sometime you want gravity to lead the water to the outside. You do not want an edge where water can run down and get under the flashing.
Install the window checking for plumbness and corner to corner squareness. You can use a sealant caulk under the window fin. Most mfg call for it. It does make future removal difficult. Personal choice. I don't most often. I reply on an outer layer of Vycor Plus.
Then using 4 inch wide Vycor Plus flashing, or equivalent, flash the outside over the fin and existing wall sheathing. It is not necessary to flash over the bottom fin. The theory is that if water does get in there then it can run out. The sill is already protected with the flashing over the RO. Flash sides and the top. Be careful at the top. Do not bother with the window trim at this point.
Note that the edges of the self adhesive flashing will sometimes curl and fishmouth. For this reason I like to use either aluminum foil tape or the acrylic house wrap tape to seal the edge of the flashing to the sheathing.
One possible difficulty would be in getting the tapes to stick well to the sheathing if it is rough or has had any treatments that repell water. Depends.
Then when you are ready to apply house wrap do that. Cut out the window opening carefully, ---
1. Leave enough space to apply a second layer of flashing around the window opening to seal the house wrap in place. or just use the acrylic house wrap tape.
Then the usual and best looking way to side and trim is to install the trim, then the siding. Then caulk.
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optimistic
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# Posted: 2 May 2013 07:29am
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Excellent guide ICC. Thank you
What you are saying is that I can use the Vycor flashing straight on the wood siding and later on connect more to the wrap. Should I put trim around the window to protect the flashing tape?
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Truecabin
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# Posted: 2 May 2013 11:55am
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Quoting: optimistic The problem with doing that is that Tyvek can be exposed to UV for 3-6 months but I will not get to the live edge boards in time....
wrap it twice to protect the under layer from UV
peel off the outer layer just before putting the siding
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ICC
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# Posted: 2 May 2013 12:53pm
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Quoting: optimistic Should I put trim around the window to protect the flashing tape?
I've had Vycor exposed for nearly a year. I would tape the edges with acrylic house wrap or foil tape just in case it wants to curl back
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Borrego
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# Posted: 2 May 2013 02:42pm
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When/if caulking, remember not to caulk the bottom. You want to allow any moisture that does get in there to have a way out
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Josh8880
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# Posted: 3 May 2013 06:22am
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Optimistic,
Do you have any pictures of your structure? Im interested in doing a 12 by 12 lofted cabin. Thanks!
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