Replies

1. 
   Ricks503 | Jun 12, 2005 10:41pm | #1

   You would be better off posting this in Break Time and including what county and city you are in.

   1 - measure the board twice, 2 - cut it once, 3 - measure the space where it is supposed to go        4 - get a new board and go back to step 1
2. 
   migraine | Jun 13, 2005 08:29pm | #2

   As perviously suggested, post on breaktime.  There are "code" requirements as to how many/how far apart, but this depends on engineereing calculations.

   But, If it were me, I'd use nails(as in air nailer) alot easier.  Even if you have to rent a gun.  But then again, it does depend on how many sheets you are putting up.   I would suggest that if you don't want to hastle it, go three inches on center around the edges and 6-8 inches in the field(center of panel).  I'm not a framer/structural person, so this is just a thought.  As always, best to ask the Building Dept.

1. 
   WillGeorge | Jun 13, 2005 08:44pm | #3

   Not sure what the code is but I saw a house after a tornado.. Mine! More than several years ago... 

   I used stainless steel screws to fix the plywood to the rafters on the roof...

   I found some rafters with the plywood attached.. THEM screws HELD! Not the wood!

3. 
   BarryO | Jun 14, 2005 10:16am | #4

   Probably not, but ask on Breaktime.  The reason?  Nails have engineered rating for shear strength, and withdrawal strength, depending on nail size, depth in wood, wood species, etc.  The nailing schedules in the code are designed with these engineeried rating in mind.

   Screws, on the other hand, typically have no set ratings.  They are usually not as strong as nails of the same diameter, as the shaft is weakened by the threads.  Drywall screws in particular have almost no shear strength, as they are very brittle.

   Edit:  I just read all the BS this has generated over on Breaktime.  Short answer:  screws are a no-no, unless specifically engineered and code-approved as nail replacements, such as those Senco nails talked about on the Breaktime thread.

   Or, unless the inspector says they're Ok. ;)

   
   

   ---

   Edited 6/14/2005 3:24 am ET by BarryO

4. 
   Elcoholic | Jun 14, 2005 04:13pm | #5

   I don't have the answer but a related story.  In the very late 90's there was a big earthquake in Flanders, CA, a small town in the desert.  Everything was knocked flat except a coworker's parent's house that happened to be right at the epicenter, dead-nuts, ground zero.  For a week or two scientists from CalTech, engineers and ICBO members were checking it out to see why it survived, unscathed.  Flanders was one of the few remaining places in CA, where you could build a house without a building permit.  This house was built one room at a time over a period of several years.  Each wall of each room was a screwed, shear wall w/ ply both sides and the walls were bolted together to form a shearwall box.  Adjacent rooms were bolted to the next and so on.

   John O'Connell - JKO Handcrafted Woodworking

   The more things change ...

   We trained hard, but it seemed that every time we were beginning to form up into teams, we would be reorganized.  I was to learn later in life that we tend to meet any new situation by reorganizing; and a wonderful method it can be for creating the illusion of progress while producing confusion, inefficiency, and demoralization.

   Petronious Arbiter, 210 BC

1. 
   jazzdogg | Jun 15, 2005 02:12am | #6

   John,

   Thanks for the thought-provoking post. Sounds like that method could be adapted, at little additional cost, to create integral chases for electrical, plumbing, HVAC, and built-in storage - although I'm not sure what effect such a system would have on noise propagation/suppression.

   Thoughts?

    -Jazzdogg-

   Whether you think you can, or you think you can't, you're right.

1. 
   chills1994 | Jun 15, 2005 03:36am | #7

   Screwed furring strips and plywood sheathing over an existing roof on a gym.  Tore off the shingles first.

   The roof had 2 X 6's as the first layer, which also acted like the finish ceiling.

   Used real 5/8 or 3/4 plywood, not OSB.  Went pretty fast with a screw gun, pitch was real shallow too.

   Saw on a TOH segment where they actually used "liquid nails" on the studs before nailing on the sheathing.  They also had to use full head nails out of a nail gun and were real sure to have the depth set just so.  Not too deep, and not where you had to hammer them home.

   Saw on another TOH episode where Steve Thomas went to the insurance industry house.  There, they recommended 3/4" ply nailed amazingly close together for the roof deck.  And of course, hurricane clips.

   Screwing floor decking is becoming more the norm around these parts (southwestern IL, metro St. Louis).

   Chills

2. 
   Elcoholic | Jun 15, 2005 05:25am | #8

   The best sheet  stock materials for speaker enclosures are particle board and mdf because they're acoustically dead.  I've had a lot of trouble (professionally) with office bldg tenant complaints about noise from cell site air conditioners on plywood "diapham" roof decks, even with the upgraded acoustic/vibration bases.  So I'd say plywood would transmit sound, but solid foam insulation would probably do the trick.  Back in the early 70's when cool vans in SoCal had names painted on them, I helped a buddy do his new Econoline.  We shot the whole back with expanding polyurethane foam and rasped it down down flush with the bulkheads and covered it in fabric-backed cork.  After double-padding the floor, carpeting, and macrame curtains in the back windows that van was as quiet and private as a limo and stayed fairly cool in the heat.  The guy's name was Craig Morrison, so of course the van's name was "Van Morrison". 

   John O'Connell - JKO Handcrafted Woodworking

   The more things change ...

   We trained hard, but it seemed that every time we were beginning to form up into teams, we would be reorganized.  I was to learn later in life that we tend to meet any new situation by reorganizing; and a wonderful method it can be for creating the illusion of progress while producing confusion, inefficiency, and demoralization.

   Petronious Arbiter, 210 BC

   Edited 6/14/2005 10:34 pm ET by ELCOHOLIC

1. 
   WillGeorge | Jun 15, 2005 07:20pm | #9

   Back in the early 70's when ..

   Back in the Very late 50's when it was COOL to have anything! HiFi... I Put a 16" speaker on the attic floor.. Bolted that sucker down! Hooked up my 100 WATT Heath Kit and put on Bills old 'Rock Around the Clock'?..

   Mom kicked me out of the house!