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CR Base Sheet Fastener

OMG CR Base Sheet Fasteners are one-piece, precision formed from G-90 galvanized steel, coated with CR-10, and pre-assembled with a 2.75-in. diameter galvalume plate.  These fasteners are available in two sizes and can be used to secure base sheets to poured lightweight insulating concrete, and on certain poured gypsum decks.

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MDC Approved
FM Approved
Features & Benefits

Features & Benefits

  • CR Base Sheet Fasteners are packaged for easy handling on the roof.
  • OMG Assembled CR Base Sheet Fasteners are FM and Miami-Dade County approved.
Product Use

Product Use

Surfaces must be dry and resonably smooth prior to roofing.  For best performance, the fastener must always be installed perpendicular to the substrate.


CR 1.2 BSF - Designed for use on minimum 1.25-in. thick poured lightweight insulating concrete and some gypsum decks.  A pull test is required to determine suitability.


CR 1.75 BSF - Designed for use on minimum 2-in. thick poured lightweight insulating concrete decks only.  Not to be used on poured gypsum decks.


OMG Assembled CR Base Sheet Fasteners are FM approved and rated 1-150 with certain fastener, base sheet, and insulating concrete combinations.  Consult the roofing system manufacturer for specific wind ratings.


NOTE: Prior to job start, contact roof cover manufacturer to determined the correct nailing pattern.  On re-roofing applications, roof should be inspected and tested to determine pullout values.

Technical Data

Technical Data

Head Diameter:   1.125-in. x 1-in. (28.5mm x 25.4mm)
Plate Material:   2.75-in. diameter Galvalume
Leg Lengths:   1.2-in. & 1.75-in.


Coating:   OMG’s CR-10 corrosion resistant coating which passes the corrosion requirements of FM Approval Standard 4470 and ETAG 006.

Packaging Information

Packaging Information

CR Base Sheet Fastener

Cat. No. Length (in) Packaging Weight (lbs)
CRBSA120 1.20 1000 37
CRBSA134 1.75 500 21
MULTIPOGO 39.5 1 25