Product Data Sheet
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One-Component Building Envelope Membrane
BEM is a one-component, cold-applied, non-slump membrane that can be used for a variety of applications with building envelope products from W. R. MEADOWS. BEM cures to form a tough, flexible membrane. BEM is a high quality moisture-curing elastomeric sealing material.
BEM can be used in the forming of fillets and reinforcement at corners. BEM is also compatible with glass-mat exterior sheathing.
- Bonds to asphalt and concrete.
- Solvent-free; will not shrink.
- Skins over in 50 minutes.
- Does not freeze.
- Cures to a tough, flexible membrane.
20 Oz. (600 mL) Sausages (12 per Carton)
28 Oz. (828 mL) Cartridges (12 per Carton)
As a corner reinforcement and fillet, approximately 14 lineal ft./gal. (1.1 m/L). For a 3″ (76.2 mm) flashing, approximately 17 lineal ft./gal. (1.4 m/L). As a fillet, approximately 135 lineal ft./gal. (10.9 m/L).
When stored indoors and in original, unopened containers at temperatures between 40° – 70° F (4° – 21° C), shelf life is one year from date of manufacture.
- Complies with all current federal, state, and local maximum allowable VOC requirements, including National EPA VOC Emission Standard for Architectural Coatings, CARB, LADCO, OTC Phase I and II, and SCAQMD.
VOC Content: 26 g/L
Surface Preparation … All surfaces to be covered with BEM should be clean, free of all contaminants, dry, and frost-free.
Application Method … Trowel on BEM to a minimum thickness of 90 mils. When dispensing material, make sure to cut nozzle 1.5″ (38.1 mm). BEM may be applied to both primed and unprimed asphalt and concrete surfaces. Apply in 3″ (76.2 mm) or 4″ (101.6 mm) wide strips of material over terminations. When used as a corner reinforcement, apply a minimum of 6″ (152.4 mm) wide in each direction. When used as a fillet, the face should be a minimum of ¾” (19.1 mm). At drains and protrusions, BEM should overlap the W. R. MEADOWS building envelope product membrane at a minimum of 2″ (50.8 mm) and should extend 6″ (152.4 mm) above the surface or to the top of the wearing course.
If applying fresh material over the cured membrane, the cured membrane should be lightly washed and wiped with alcohol. Allow for a few minutes to dry and trowel on the fresh material.
BEM is also compatible with AIR-SHIELD products from W. R. MEADOWS for joint detailing in exterior sheathing panels. For detailed application instructions, please view our AIR-SHIELD EXTERIOR SHEATHING PANELS INSTALLATION GUIDELINES document on our website.
Drying Time … 50 minutes +/- 15 minutes. Discard material that begins to thicken and becomes difficult to apply. BEM will cure to form a tough, flexible membrane.
Cleanup … Tools can be cleaned with alcohol. Follow manufacturer’s precautions when using alcohol for cleanup. Cured material is best removed by mechanical means.
BEM is not to be used as a liner in a water-containing structure or as an exposed or wearing surface. BEM is a fluid-applied membrane that is designed to be used as part of a complete building envelope and drainage system. Do not use on surfaces that are later to be painted. Do not store in high temperatures. Refer to Safety Data Sheet for complete health and safety information.
May help contribute to LEED credits:
- MRc9: Construction and Demolition Waste Management
- EQc2: Low-Emitting Materials [For Healthcare and Schools (exterior-applied products) ONLY]