It's been raining on my damn house for 3 days now with no roof. It's
raining directly onto the second floor deck. Is this a problem? Is
this just a fact of life? Will there be damage? What should I do?
What *can* I do? The builder said he brushed on Thompson's water seal
onto the floor deck. Does that help? Thanks. -John
relax. plywood/osb can take a lot of water--google "exposure 1
plywood." people will tell you how terrible it is, yet the only time
i've heard of someone having trouble with a subfloor, the manufacturer
paid to replace it. it ain't gonna melt in the rain.
Don, I'd double check that,
That site claims *textured* side up.
I installed OSB for a floor shiny side up and it
went scaly from snow and stuff that I tracked
in. I thought shiny side would be easier to
sweep, but I think I made a mistake over-all.
Hmmm...I will check that out.
I was just told last week by my brother, shiny side up.
Regardless, I'll have black paper on the whole thing almost immediately.
I've seen roofs sit for weeks in FL with OSB on and no felt and there were
Where I'm at though the cold air combined with massive rain may make a fatal
BTW: I'm going to install blocking between the trusses at 48" centers.
I never liked the idea that roof plywood is only nailed at the trusses.
I want my plywood nailed on all 4 sides.
Actually, there is a structural benefit. A blocked diaphragm has a higher
load capacity for the same nail spacing as an unblocked diaphragm.
Having said that, it takes a pretty big roof (think 60x100) before one
even begins to approach the load capacity of an unblocked diaphragm.
For 7/16" OSB or 15/32" plywood, edge clips at midspan are required by
code when the support spacing is more than 16" o/c. However, if you use
19/32" (5/8") sheathing then clips are not required.
Bob Morrison, PE, SE
R L Morrison Engineering Co
I've used blocking between trusses to keep
them aligned vertically, but because the roof
was T&G, I didn't worry about them being
carefully aligned to any seam so the blocks
could be offset for easy nailing. A floor is
a different story (pun) because a live load
moves on it and blocking transfers load to
adjacents joists. But a roof has a dead snow
load, and for the most part, each truss is
equally burdened so blocking them for
strength is not very effective, that I can see.
Not sure I recall Don mentioning his roof
sheathing, certainly if it's not T&G then
blocking for the edges is certainly best,
(I've done that on small buildings).
Hear ya, wow, as a kid I loved studying the
inside of old barns, could almost smell the
sweat and intelligence in framing those roofs.
The timber in those is awesome, especially
the axe marks.
In the progressive 60's and 70's those were
discarded as junk as New & Improved metal
tech vogued, and the original barns were left
to decay. But you gotta love the neat truss
designs they used, and as you mention,
designed for serious lateral (wind+) loads too.
Recall the different styles of lightning rods?
Ps: a helicopter just landed in the neighbours
There is a specified way to install OSB on both floors and walls. OSB
can handle being exposed to some pretty harsh weather. I'm a framer in
Utah, and we get tons of snow and rain on the benches.. We've chipped
away icebergs from our floors and still not have a squeak. The only
time you really need to worry about your OSB is when it is sitting ON
the ground. or soaking IN a puddle, but as far as having rain hitting
it, that's not a problem. if you have puddles in your floor, then your
framers should be kicked, but just smack a hole in it with your hammer
and it'll drain. Since it's engineered wood, you wouldn't need to
worry about your little hole ruining the stuctural stability..
Ken S. Tucker wrote:
You can drape a million dollars worth of tarps over it.
Or do a reverse rain dance.
I'll be going through the same thing next week.
It rains like 4 mf around here and right now my truck is stuck in about a
foot of pure mud where the driveway used to be.
This is all new stuff to me.
Yeah, we're in the rainy season around here, too. But it beats the
Do you want to compare crappy weather forecasts. Here's ours. You
can't make up the crap.
Tonight: A slight chance of showers after midnight. Cloudy, with a low
around 47. West wind around 7 mph. Chance of precipitation is 20%.
Thursday: Showers likely, mainly after noon. Cloudy, with a high near
61. South wind between 4 and 7 mph becoming calm. Chance of
precipitation is 70%. New rainfall amounts between a tenth and quarter
of an inch possible.
Thursday Night: Periods of rain. Low around 40. Light wind becoming
north between 13 and 16 mph. Chance of precipitation is 100%. New
rainfall amounts between three quarters and one inch possible.
Friday: Periods of rain, mainly before noon. High near 48. Northwest
wind between 11 and 13 mph. Chance of precipitation is 90%. New
rainfall amounts between a quarter and half of an inch possible.
Friday Night: A chance of showers, mainly before 8pm. Partly cloudy,
with a low around 35. West wind between 6 and 10 mph. Chance of
precipitation is 30%.
Saturday: A slight chance of showers before 8am. Partly cloudy, with a
high near 51. Chance of precipitation is 20%.
Saturday Night: A chance of rain showers after 8pm, mixing with snow
after 4am. Partly cloudy, with a low around 34. Chance of precipitation
Sunday: Snow or rain showers likely. Mostly cloudy, with a high near
50. Chance of precipitation is 60%.
Sunday Night: Rain showers mixed with snow showers likely. Cloudy, with
a low around 35. Chance of precipitation is 60%.
Monday: A chance of snow or rain showers. Cloudy, with a high near 45.
Chance of precipitation is 50%.
Monday Night: A chance of snow or rain showers. Mostly cloudy, with a
low around 28. Chance of precipitation is 50%.
Tuesday: A chance of snow or rain showers. Mostly cloudy, with a high
near 43. Chance of precipitation is 40%.
Tuesday Night: A chance of showers. Partly cloudy, with a low around
29. Chance of precipitation is 30%.
Wednesday: A chance of snow or rain showers. Partly cloudy, with a high
near 44. Chance of precipitation is 40%.
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