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# Re: Glulam roof girders

• To: seaint(--nospam--at)seaint.org
• Subject: Re: Glulam roof girders
• From: Scott Maxwell <smaxwell(--nospam--at)engin.umich.edu>
• Date: Mon, 20 Nov 2006 00:36:45 -0500 (EST)

```If you do cut the slope into the top of the glulam beam (i.e. bevel cut
it), then be careful of your stresses.  If the cut slope is deep enough,
you could be causing stresses to be introduced into the laminations of the
glulam that are not the same as the top, cut laminations and thus could be
"overstressing" the laminations.  This can especially be true if you are
using and need a balanced lamination/grade (i.e. 24F-V8).

Instead of beveling the top lamination, I personally like leaving the top
of the glulam alone but placing a bevel cut "shim" piece on top (i.e. a
bevel cut 2x or LVL or couple of 2xs).  We encounter such situations
frequently in the SIP world.

Regards,

Scott

On Sun, 19 Nov 2006, Roger Davis wrote:

> You can do it either way. You can have the beam faces vertical and have the top of the beams shaped for your slope or you can have the side faces of the beams perpendicular to the roof slope. If you have the side faces perpendicular to the roof slope, then you have to design the beams for the additional force parallel to the roof slope or take that force out in the deck diaphragm.
>
>   Roger Davis
>   Architect
>   SDS Architects, Inc.
>
>
> Will Haynes <gtg740p(--nospam--at)gmail.com> wrote:
>     On a sloped roof using glulam girders (the girders are running perpendicular to the slope, 2x joists running parallel with the slope) how is the roof sheathing normally attached to the glulams? Are the glulams actually rotated so the sloped sheathing sits flat on the top lamination or is the top of the glulam cut at the same angle as the slope?   I would think it would be difficult to erect if all the girders had to be rotated.
>
>   I made a quick sketch to show what I mean:
>
>   http://i135.photobucket.com/albums/q141/haynewp/GL.jpg
>
>
>
>   Will Haynes
>
>
>
> Roger Davis
>   Architect
>   SDS Architects, Inc.
>
>
> ---------------------------------
>
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