Metal Building

1. 1)      Maximum roof slope is 1:12.

1. 2)      Long Bay Systems require 3 weeks in fabrication.

1. 3)      Available in red or gray primer.

1. 4)      Standard seat depth is 5”. 

1. 5)      Standard Long Bay purlin to rafter connection is bolted. (Welded Long Bay purlin to rafter connection is optional – although erection bolts are required to meet OSHA requirements.)

1. 6)      Minimum Long Bay purlin depth is 12”.  Maximum Long Bay purlin depth is 44”.

1. 7)      Minimum Long Bay purlin length is 8’-6”.

1. 8)      Maximum Long Bay purlin length is 65’-0”: 2” chords are typical for most loads, (check with design).

1. 9)      Soldier columns will be located at center of bay unless otherwise noted.

1. 10)   If cable bracing is designed it may run through the Long Bay purlin.  Bracing may be located below the bottom chord for ease of erection, but it may not always be the most cost effective location.

1. 11)    If rod bracing or angle bracing is designed it must run beneath the Long Bay purlin.

1. 12)    Interior bracing may make a project more economical.  If allowed, please note locations and type permitted i.e., cable, rod, angle, portal or “K”.

1. 13)    Exterior columns may be omitted & endwalls may utilize ledger angle depending on hard wall design.

1. 14)    Hard wall must be held a minimum 1 ½” below the top of the Long Bay purlin, see LBS drawings LB140, LB405.

1. 15)    Oversized gutter and downspouts are common – oversized gutter will be designed to overflow the front face of the gutter to avoid water back flow onto the roof.

1. 16)    If downspout spacing is critical state within special notes – design determines spacing based on roof area and rainfall intensity.

1. 17)    Check for sub-grade drainage requirements, state within special notes on Purchase Order.

1. 18)    Check for downspout extensions below finished floor, state within special notes on Purchase Order.

1. 19)    Check for downspout recess into hard wall, provide detail, state within special notes on Purchase Order.

1. 20)   For a single roof panel run greater than 250' or for buildings longer than 500', contact the Long Bay Design department for expansion joint requirements.

1. 21)    On hard wall projects, make sure to note building length and width as out-to-out of hard wall and note with or without sidewall columns.  Verify wall thickness and steel set-back from inside of wall.

1. 22)   If standing seam roof is used, machine seamed roof panel is required.

1. 23)    Through-fastened panel is limited to 50’ of single roof surface.

1. 24)    “B” deck roof panel is allowed, and must be screwed to the long bay purlin.  Weld washers are not allowed, power actuated fasteners are not allowed.  Specify “B” deck required (Type and Exterior & Interior Finish/Color).

q  Gray Exterior/White Interior  q White Ext./Gray Int.  q White Ext./White Int.  q Gray Ext./Gray Int.                    q 22ga G60 Galvanized (33 KSI/ASTM A653) q 22g G90 Galvanized, (33 KSI/ASTM A924)

1. 25)    Break down proper dead load for all types of built up roof system being utilized i.e. single ply, multi ply, ballast, etc., and weights of each component of the roof.

1. 26)    With “B” deck projects, the frames may run the length of the building in lieu of the width as long as the roof slope is no more than ¼:12 – if a ridge is required a frame will be located at the ridge.

1. 27)   Roof framed openings will always be field located and normally framed with angles and cold formed channels and fastened with self drilling screws.  Long Bay purlins may not be field cut.  Clear opening requirements must be noted at time of quote.

1. 28)    When minimum clearances are required specify as under all steel, frame, soldier rafter, or long bay purlin.

Each project is custom designed and detailed.  Guidelines may vary on individual projects