[Spridgets] Now: ponderosa pine (was: car lift)

[Dean Swanson]

For all you math types, you can go here:
http://www.matweb.com/search/datasheet.aspx?matguid=be613a162b34418bbd65355f
5ea8b155&ckck=1  to get the mechanical properties of ponderosa pine to see
just how much it will hold.

This might help:
http://www.awc.org/calculators/connections/ccstyle.asp?design_method=ASD&con
nection_type=Lateral+loading&fastener_types=Nail&loading_scenario=Single+She
ar&mm_type=Spruce-Pine-Fir&mm_thickness=1.5&mm_thickness_text=&sm_type=Plywo
od+(other+grades)&sm_thickness=0.46875&sm_thickness_text=&fast_dia=box&nail_
size=6d&load_duration=1.0&wet_svc_factor=1.0&end_grain=1.0&temperature=1.0&d
iaphragm=1.0&submit2_LNS=Calculate+Connection+Capacity



-----Original Message-----

Subject: Re: [Spridgets] car lift

You could try using 4 vertical sections of 4"x4" under the joists as close 
as possible to the hanging points and it wouldn't be too difficult to get 
hold of some strengthening U shaped metal sections for under where the joist

is used for hanging.  Extend those into a metal support area side to side 
between the hanging points.  You could cut a slot into the top of the 4"x 4"

so it holds a little better under the joist.  They would still be a pain and

get in the way.
A normal roofing joist is not designed or constructed to take additional 
weight on point loads and like Gerard, would be very, very wary of the 
project. You may find the house insurance won't cover you for the rebuild of

a roof if you have dragged it down yourself.

Guy R Day