I'm about to buy a Grizzly G1023SL table saw (left tilting with weight
spec'd at 430 lbs on a 20.5" x 20.5" base) and am a little concerned
about putting that kind of weight on my shop floor.
The shop is 12' x 20' with 1/2" plywood floor over 2x6's at 16"OC
(they span the 12' width). The whole thing is supported on 10 piers
around the perimeter without any additional support in the middle.
Should I be concerned?
Thanks,
-Bo
Bo asks:
>I'm about to buy a Grizzly G1023SL table saw (left tilting with weight
>spec'd at 430 lbs on a 20.5" x 20.5" base) and am a little concerned
>about putting that kind of weight on my shop floor.
>
>The shop is 12' x 20' with 1/2" plywood floor over 2x6's at 16"OC
>(they span the 12' width). The whole thing is supported on 10 piers
>around the perimeter without any additional support in the middle.
>
>Should I be concerned?
I'd be concerned without the saw. That's really over span for a 2x6, and the
1/2" ply doesn't help matters.
Can you get under the floor and add a doubled beam up the middle, support on
the ends and in the middle?
Charlie Self
"Bore, n.: A person who talks when you wish him to listen." Ambrose Bierce, The
Devil's Dictionary
On 20 Aug 2004 10:38:53 -0700, [email protected] (Bo) wrote:
>I'm about to buy a Grizzly G1023SL table saw (left tilting with weight
>spec'd at 430 lbs on a 20.5" x 20.5" base) and am a little concerned
>about putting that kind of weight on my shop floor.
>
>The shop is 12' x 20' with 1/2" plywood floor over 2x6's at 16"OC
>(they span the 12' width). The whole thing is supported on 10 piers
>around the perimeter without any additional support in the middle.
>
>Should I be concerned?
>
Yes.
Can you get a beam under the middle?
Even then the 1/2 plywood it too thin.
You will need to beef it up under the saw.
You may also want to diagonally brace those piers. I would not want to put
much weight, vibration and movement if the tall ones are not braced. The
whole shed could fall into the ravine.
"Bill Rogers" <[email protected]> wrote in message
news:[email protected]...
> On 20 Aug 2004 10:38:53 -0700, [email protected] (Bo) wrote:
>
> >The shop is 12' x 20' with 1/2" plywood floor over 2x6's at 16"OC
> >(they span the 12' width). The whole thing is supported on 10 piers
> >around the perimeter without any additional support in the middle.
> >
> >Should I be concerned?
>
> If you are of a mind to have only 1/2" plywood for a floor over 16"
> spans, you should be concerned about doing any woodworking at all. No
> matter if you inherited it or built it, rebuild it ...properly ...even
> if you don't have a ton and a half of shop tools.
>
> Bill.
>
"Bill Rogers" <[email protected]> wrote in message
news:[email protected]...
> On 20 Aug 2004 10:38:53 -0700, [email protected] (Bo) wrote:
>
> >The shop is 12' x 20' with 1/2" plywood floor over 2x6's at 16"OC
> >(they span the 12' width). The whole thing is supported on 10 piers
> >around the perimeter without any additional support in the middle.
> >
> >Should I be concerned?
>
> If you are of a mind to have only 1/2" plywood for a floor over 16"
> spans, you should be concerned about doing any woodworking at all. No
> matter if you inherited it or built it, rebuild it ...properly ...even
> if you don't have a ton and a half of shop tools.
>
> Bill.
I'd be more concerned with 2x6's spanning 12 feet than I would with 1/2" ply
spanning 16". I agree that 1/2in does not make a good floor, but 12' is too
long for 2x6 floor joists.
--
-Mike-
[email protected]
On 20 Aug 2004 10:38:53 -0700, [email protected] (Bo) wrote:
>The shop is 12' x 20' with 1/2" plywood floor over 2x6's at 16"OC
>(they span the 12' width). The whole thing is supported on 10 piers
>around the perimeter without any additional support in the middle.
>
>Should I be concerned?
If you are of a mind to have only 1/2" plywood for a floor over 16"
spans, you should be concerned about doing any woodworking at all. No
matter if you inherited it or built it, rebuild it ...properly ...even
if you don't have a ton and a half of shop tools.
Bill.
"Bo" <[email protected]> wrote in message
news:[email protected]...
> I'm about to buy a Grizzly G1023SL table saw (left tilting with weight
> spec'd at 430 lbs on a 20.5" x 20.5" base) and am a little concerned
> about putting that kind of weight on my shop floor.
>
> The shop is 12' x 20' with 1/2" plywood floor over 2x6's at 16"OC
> (they span the 12' width). The whole thing is supported on 10 piers
> around the perimeter without any additional support in the middle.
>
> Should I be concerned?
>
> Thanks,
>
> -Bo
Seems a little light. My shops on a concrete pad, but we do have an aquarium
in a similar sized room with 2*8 joists. The aquarium probably weighs about
800 pounds, but it's on the outside wall perpendicular to the joists. It's
been there a year, but YMMV.
Get two large friends to stand beside you in the spot where you want the saw
and see how much give the floor has.
I guess you don't want to spread out the weight of the saw by building a
longer base (90 to joists) for it? This would play havoc with the height and
make it a bitch to move.
in article [email protected], [email protected] at
[email protected] wrote on 8/20/04 10:47 AM:
> On 20 Aug 2004 10:38:53 -0700, [email protected] (Bo) wrote:
>
>> I'm about to buy a Grizzly G1023SL table saw (left tilting with weight
>> spec'd at 430 lbs on a 20.5" x 20.5" base) and am a little concerned
>> about putting that kind of weight on my shop floor.
>>
>> The shop is 12' x 20' with 1/2" plywood floor over 2x6's at 16"OC
>> (they span the 12' width). The whole thing is supported on 10 piers
>> around the perimeter without any additional support in the middle.
>>
>> Should I be concerned?
>>
> Yes.
> Can you get a beam under the middle?
> Even then the 1/2 plywood it too thin.
> You will need to beef it up under the saw.
>
>
That's what I suspected. The room was built as a storage area originally.
I do have good access underneath though it's on a pretty steep slope (about
3' above grade on one side and about 12' above on the other [then drops
another 15' into a creek that our house spans]).
So if I were to run a double beam of say two 2x10s (or?) down the center of
the 20' length (making the 2x6s span only 6') and support it with another
4-5 piers and then use additional ply (maybe 1/2"-3/4") under the saw
itself..does that seem like I might be in better shape?
I don't want to win a Darwin award and drop my new saw through the floor
into the creek!
Thanks for all the help!
Bo Hick asks:
>
>That's what I suspected. The room was built as a storage area originally.
>I do have good access underneath though it's on a pretty steep slope (about
>3' above grade on one side and about 12' above on the other [then drops
>another 15' into a creek that our house spans]).
>
>So if I were to run a double beam of say two 2x10s (or?) down the center of
>the 20' length (making the 2x6s span only 6') and support it with another
>4-5 piers and then use additional ply (maybe 1/2"-3/4") under the saw
>itself..does that seem like I might be in better shape?
What I'd do is run tripled 2x10s, three piers, though four lets you place all
breaks on a pier. Then come back with 3/4" T&G flooring. Screw that down. You
might want to use adhesive, too.
Then, when you go nuts and decide you gotta have an 800 or 900 pound 20"
planer, you're safe.
Charlie Self
"Bore, n.: A person who talks when you wish him to listen." Ambrose Bierce, The
Devil's Dictionary
That, or use 1-1/8" Sturdifloor, a T&G flooring product
that's even avail. at HD. For that small of an area, the
cost bump is insignificant.
David
Charlie Self wrote:
> Bo Hick asks:
>
>
>>That's what I suspected. The room was built as a storage area originally.
>>I do have good access underneath though it's on a pretty steep slope (about
>>3' above grade on one side and about 12' above on the other [then drops
>>another 15' into a creek that our house spans]).
>>
>>So if I were to run a double beam of say two 2x10s (or?) down the center of
>>the 20' length (making the 2x6s span only 6') and support it with another
>>4-5 piers and then use additional ply (maybe 1/2"-3/4") under the saw
>>itself..does that seem like I might be in better shape?
>
>
> What I'd do is run tripled 2x10s, three piers, though four lets you place all
> breaks on a pier. Then come back with 3/4" T&G flooring. Screw that down. You
> might want to use adhesive, too.
>
> Then, when you go nuts and decide you gotta have an 800 or 900 pound 20"
> planer, you're safe.
>
>
> Charlie Self
> "Bore, n.: A person who talks when you wish him to listen." Ambrose Bierce, The
> Devil's Dictionary
David <[email protected]> wrote in
news:[email protected]:
> That, or use 1-1/8" Sturdifloor, a T&G flooring product
> that's even avail. at HD. For that small of an area, the
> cost bump is insignificant.
>
> David
>
I've used this stuff recently, but it's also been around for maybe thirty
years in a similar form. We put it down with Liquid Nails and pneumatic-
driven 16's. The floor no longer bounces. At all.
Less than $50/sheet at Orange BORG. Take someone along to help you load
it. Not a one person job for anyone I know.
Patriarch
>
> No shortage of opinions here, and here's mine. What you have is a real nice
> trampoline; boing! boing! boing! Sounds like you had Darwin for an
> architect; 2X6 joists with 12 foot span overhanging a river.
>
Actually my grandfather (a firm believer in Darwin) built in the early 70s.
I think he was flying the communist flag in front of the house at the time
and probably smoking a lot of what he was growing. It is Northern California
after all! I think the only reason it's still holding together pretty well
is because my grandmother oversaw it all.
-Bo
in article [email protected], [email protected] at
[email protected] wrote on 8/20/04 11:37 AM:
> On Fri, 20 Aug 2004 11:18:03 -0700, Bo Hick <[email protected]> wrote:
>
>> in article [email protected], [email protected] at
>> [email protected] wrote on 8/20/04 10:47 AM:
>>
>>> On 20 Aug 2004 10:38:53 -0700, [email protected] (Bo) wrote:
>>>
>>>> I'm about to buy a Grizzly G1023SL table saw (left tilting with weight
>>>> spec'd at 430 lbs on a 20.5" x 20.5" base) and am a little concerned
>>>> about putting that kind of weight on my shop floor.
>>>>
>>>> The shop is 12' x 20' with 1/2" plywood floor over 2x6's at 16"OC
>>>> (they span the 12' width). The whole thing is supported on 10 piers
>>>> around the perimeter without any additional support in the middle.
>>>>
>>>> Should I be concerned?
>>>>
>>> Yes.
>>> Can you get a beam under the middle?
>>> Even then the 1/2 plywood it too thin.
>>> You will need to beef it up under the saw.
>>>
>>>
>>
>> That's what I suspected. The room was built as a storage area originally.
>> I do have good access underneath though it's on a pretty steep slope (about
>> 3' above grade on one side and about 12' above on the other [then drops
>> another 15' into a creek that our house spans]).
>>
>> So if I were to run a double beam of say two 2x10s (or?)
>
> IMO 3ply 2x8s would be a better choice.
>
>> down the center of
>> the 20' length (making the 2x6s span only 6') and support it with another
>> 4-5 piers and then use additional ply (maybe 1/2"-3/4") under the saw
>> itself..does that seem like I might be in better shape?
>>
> 3/4 inch screwed down would be about right.
> I have a friend who used 2 glued sheets of 3/4 K3 particle board to firm up
> under his jointer. K3 is cheap, just don't get it wet.
>
>> I don't want to win a Darwin award and drop my new saw through the floor
>> into the creek!
>>
>> Thanks for all the help!
>
Thanks to everyone for all the advice...what a great resource! I went down
today and drilled a small hole through the floor and found that it is
actually 3/4" ply (not 1/2"). Not that that really changes a whole lot in
the long run.
I think my plan is going to be:
Triple up 2x8s (I have many long ones around) run them down the middle and
support them with piers in four locations. Then screw & glue some sort of
sheet good (maybe Sturdi-floor or OSB [I'm not familiar with K3]) overlay to
the whole floor.
As it stands I'm surprised by how little trampoline effect I get right now.
If I stand in the center of the floor and hop up and down (I'm 180 lbs) I
don't notice any real deflection in the floor. At any rate, I'm going to
beef if up and get that saw in there!
Thanks again,
-Bo
On 20 Aug 2004 17:43:14 GMT, [email protected] (Charlie Self) wrote:
>Bo asks:
>
>>I'm about to buy a Grizzly G1023SL table saw (left tilting with weight
>>spec'd at 430 lbs on a 20.5" x 20.5" base) and am a little concerned
>>about putting that kind of weight on my shop floor.
>>
>>The shop is 12' x 20' with 1/2" plywood floor over 2x6's at 16"OC
>>(they span the 12' width). The whole thing is supported on 10 piers
>>around the perimeter without any additional support in the middle.
>>
>>Should I be concerned?
>
>I'd be concerned without the saw. That's really over span for a 2x6, and the
>1/2" ply doesn't help matters.
>
>Can you get under the floor and add a doubled beam up the middle, support on
>the ends and in the middle?
>
If not he can work through holes in the floor, even pouring pads and slide some
support under as well. Driving long pieces of 3/4 inch rebar down the side of
each 2x6 as far into the ground as you can and then pouring concrete down to
hold them will work as well.
If not I would screw and glue 3/4 inch sheets of plywood over the existing
floor.
>Charlie Self
>"Bore, n.: A person who talks when you wish him to listen." Ambrose Bierce, The
>Devil's Dictionary
"Bo" <[email protected]> wrote in message
news:[email protected]...
> I'm about to buy a Grizzly G1023SL table saw (left tilting with weight
> spec'd at 430 lbs on a 20.5" x 20.5" base) and am a little concerned
> about putting that kind of weight on my shop floor.
>
> The shop is 12' x 20' with 1/2" plywood floor over 2x6's at 16"OC
> (they span the 12' width). The whole thing is supported on 10 piers
> around the perimeter without any additional support in the middle.
>
> Should I be concerned?
>
> Thanks,
>
> -Bo
No shortage of opinions here, and here's mine. What you have is a real nice
trampoline; boing! boing! boing! Sounds like you had Darwin for an
architect; 2X6 joists with 12 foot span overhanging a river.
I agree with a couple of the others, put a beam of 3 ply's of 2X8's down the
middle and sheath the entire floor with 3/4 ply with glue and screws (T&G
would be too costly and less structurally sound, i.e. a joint ever 2.5 to 6
inches.) 1/2" ply is not fit to walk on, much less place a heavy machine
on.
Gary
Gary responds:
>I agree with a couple of the others, put a beam of 3 ply's of 2X8's down the
>middle and sheath the entire floor with 3/4 ply with glue and screws (T&G
>would be too costly and less structurally sound, i.e. a joint ever 2.5 to 6
>inches.) 1/2" ply is not fit to walk on, much less place a heavy machine
>on.
T&G plywood isn't much more costly than straight sanded. It forms a better
floor than butt jointed.
Charlie Self
"Bore, n.: A person who talks when you wish him to listen." Ambrose Bierce, The
Devil's Dictionary
"Charlie Self" <[email protected]> wrote in message
news:[email protected]...
> Gary responds:
>
> >I agree with a couple of the others, put a beam of 3 ply's of 2X8's down
the
> >middle and sheath the entire floor with 3/4 ply with glue and screws (T&G
> >would be too costly and less structurally sound, i.e. a joint ever 2.5 to
6
> >inches.) 1/2" ply is not fit to walk on, much less place a heavy machine
> >on.
>
> T&G plywood isn't much more costly than straight sanded. It forms a better
> floor than butt jointed.
>
>
Yeah, that's the stuff I mean, 3/4" T&G plywood. In fact, I think its
called Sturdi-floor. You said "Then come back with 3/4" T&G flooring" which
I read to be solid wood "flooring". Looks like we're in sync now.
"Gary" <[email protected]> wrote in message
news:[email protected]...
> "Bo" <[email protected]> wrote in message
> news:[email protected]...
> > I'm about to buy a Grizzly G1023SL table saw (left tilting with weight
> > spec'd at 430 lbs on a 20.5" x 20.5" base) and am a little concerned
> > about putting that kind of weight on my shop floor.
> >
> > The shop is 12' x 20' with 1/2" plywood floor over 2x6's at 16"OC
> > (they span the 12' width). The whole thing is supported on 10 piers
> > around the perimeter without any additional support in the middle.
> >
> > Should I be concerned?
> >
> > Thanks,
> >
> > -Bo
>
> No shortage of opinions here, and here's mine. What you have is a real
nice
> trampoline; boing! boing! boing! Sounds like you had Darwin for an
> architect; 2X6 joists with 12 foot span overhanging a river.
>
> I agree with a couple of the others, put a beam of 3 ply's of 2X8's down
the
> middle and sheath the entire floor with 3/4 ply with glue and screws (T&G
> would be too costly and less structurally sound, i.e. a joint ever 2.5 to
6
> inches.) 1/2" ply is not fit to walk on, much less place a heavy machine
> on.
>
> Gary
>
> Oh BTW, it would be sure nice if you were to place a 12' treated 6X6 post
about half way down that beam to support it.
==================================
| | | | <--- 6X6 post | |
| | | |
| |
You are already over the limits for a 16" o.c. 2x6 span by almost 2 ft.for
a max 30 lbf/ft live load (the minimum allowed) floor. Definately add a
sturdy girder of at least double 2x10's under the exsisting and support it
in at least three places. Nail the girder together with 3 16d nails
vertically every 16" or so on both sides. Get 3/4 ply or osb and glue and
nail it to the 2x6 joists over the 1/2". Use 5-6 8d ring shank nails per 4'
row. This should solve the trampoline effect on your floor. --dave
"Bill Stock" <[email protected]> wrote in message
news:[email protected]...
>
> "Bo" <[email protected]> wrote in message
> news:[email protected]...
> > I'm about to buy a Grizzly G1023SL table saw (left tilting with weight
> > spec'd at 430 lbs on a 20.5" x 20.5" base) and am a little concerned
> > about putting that kind of weight on my shop floor.
> >
> > The shop is 12' x 20' with 1/2" plywood floor over 2x6's at 16"OC
> > (they span the 12' width). The whole thing is supported on 10 piers
> > around the perimeter without any additional support in the middle.
> >
> > Should I be concerned?
> >
> > Thanks,
> >
> > -Bo
>
> Seems a little light. My shops on a concrete pad, but we do have an
aquarium
> in a similar sized room with 2*8 joists. The aquarium probably weighs
about
> 800 pounds, but it's on the outside wall perpendicular to the joists. It's
> been there a year, but YMMV.
>
> Get two large friends to stand beside you in the spot where you want the
saw
> and see how much give the floor has.
>
> I guess you don't want to spread out the weight of the saw by building a
> longer base (90 to joists) for it? This would play havoc with the height
and
> make it a bitch to move.
>
>
On Fri, 20 Aug 2004 11:18:03 -0700, Bo Hick <[email protected]> wrote:
>in article [email protected], [email protected] at
>[email protected] wrote on 8/20/04 10:47 AM:
>
>> On 20 Aug 2004 10:38:53 -0700, [email protected] (Bo) wrote:
>>
>>> I'm about to buy a Grizzly G1023SL table saw (left tilting with weight
>>> spec'd at 430 lbs on a 20.5" x 20.5" base) and am a little concerned
>>> about putting that kind of weight on my shop floor.
>>>
>>> The shop is 12' x 20' with 1/2" plywood floor over 2x6's at 16"OC
>>> (they span the 12' width). The whole thing is supported on 10 piers
>>> around the perimeter without any additional support in the middle.
>>>
>>> Should I be concerned?
>>>
>> Yes.
>> Can you get a beam under the middle?
>> Even then the 1/2 plywood it too thin.
>> You will need to beef it up under the saw.
>>
>>
>
>That's what I suspected. The room was built as a storage area originally.
>I do have good access underneath though it's on a pretty steep slope (about
>3' above grade on one side and about 12' above on the other [then drops
>another 15' into a creek that our house spans]).
>
>So if I were to run a double beam of say two 2x10s (or?)
IMO 3ply 2x8s would be a better choice.
>down the center of
>the 20' length (making the 2x6s span only 6') and support it with another
>4-5 piers and then use additional ply (maybe 1/2"-3/4") under the saw
>itself..does that seem like I might be in better shape?
>
3/4 inch screwed down would be about right.
I have a friend who used 2 glued sheets of 3/4 K3 particle board to firm up
under his jointer. K3 is cheap, just don't get it wet.
>I don't want to win a Darwin award and drop my new saw through the floor
>into the creek!
>
>Thanks for all the help!