{"id":73815,"date":"2026-04-17T16:05:06","date_gmt":"2026-04-17T21:05:06","guid":{"rendered":"https:\/\/can.wrmeadows.com\/?p=73815"},"modified":"2026-07-28T11:40:29","modified_gmt":"2026-07-28T16:40:29","slug":"air-shield-stpe-canada-fluid-applied-moisture-cured-vapour-permeable-air-barrier","status":"publish","type":"post","link":"https:\/\/can.wrmeadows.com\/en-ca\/air-shield-stpe-canada-fluid-applied-moisture-cured-vapour-permeable-air-barrier\/","title":{"rendered":"AIR-SHIELD STPE"},"content":{"rendered":"<p><a name=\"ds\"><\/a><\/p>\n<h3 class=\"section\">Product Data Sheet<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/can.wrmeadows.com\/pics\/hdgreen.jpg\" alt=\"Product Data, W. R. MEADOWS\" width=\"678\" height=\"150\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<table border=\"0\" width=\"100%\" cellspacing=\"2\" cellpadding=\"2\">\n<tbody>\n<tr>\n<td width=\"9%\"><strong><a href=\"https:\/\/can.wrmeadows.com\/en-ca\/ca\/#072726\">07 27 26<\/a><\/strong><\/td>\n<td width=\"21%\">\n<p align=\"RIGHT\">DATA SHEET 6528-000<\/p>\n<\/td>\n<td width=\"19%\"><a href=\"https:\/\/can.wrmeadows.com\/data\/6528-000.pdf\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/can.wrmeadows.com\/pics\/pdfclick.gif\" alt=\"\" width=\"119\" height=\"23\" border=\"0\" \/><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>AIR-SHIELD<sub>\u2122<\/sub> STPE<\/strong><br \/>\n<strong>Fluid-Applied, Moisture-Cured, Vapour Permeable Air Barrier<\/strong><\/p>\n<p><strong>DESCRIPTION<\/strong><\/p>\n<p>AIR-SHIELD STPE is a single-component, moisture-cured, fluid-applied air and liquid moisture barrier that forms a tough, seamless, elastomeric membrane upon curing. The product is composed of Silyl-Terminated Polyether, providing strength and durability.\u00a0 AIR-SHIELD STPE provides excellent resistance to air leakage and can be applied in a single coat by spray, roller, or brush. When properly integrated into a well-designed wall assembly, AIR-SHIELD STPE serves as a monolithic barrier against air leakage and liquid water intrusion. It offers permanent flexibility, containing no plasticizers or oils that can leach out over time and cause brittleness or cracking.<\/p>\n<p><strong>USES<\/strong><\/p>\n<p>AIR-SHIELD STPE is specifically formulated to function as a breathable air and liquid moisture barrier, allowing vapour transmission. It can be applied to most common construction materials and is ideal for above-grade wall assemblies in both new construction and retrofit applications. Primary uses include cavity wall and masonry wall systems.\u00a0 Compatible substrates include precast and cast-in-place concrete, concrete masonry units (CMU), fiberglass mat-faced gypsum sheathing, rigid foam insulation, steel, copper, aluminium, exterior-grade plywood (untreated), and oriented strand board (OSB).<\/p>\n<p><strong>FEATURES\/BENEFITS<\/strong><\/p>\n<ul>\n<li>Quick resistance to rainfall \u2013 rain-resistant in &lt;30 minutes at 24\u00b0 C &amp; 50% RH<\/li>\n<li>Highly sprayable\/compatible with a standard Graco GH 833 Sprayer<\/li>\n<li>May also be applied by roller and brush<\/li>\n<li>UV exposure up to 12 months<\/li>\n<li>Resists the growth of mould and fungus.<\/li>\n<li>Non-asphaltic \u2013 designed to meet stringent fire code requirements<\/li>\n<li>High permeability \u2013 allows the transmission of moisture vapour through porous building materials<\/li>\n<li>Low temperature flexibility \u2013 no cracking down to -29\u00b0 C)<\/li>\n<li>Phthalate and Isocyanate free \u2013 less toxic<\/li>\n<li>Highly flexible \u2013 bridges cracks, which may form in the substrate.<\/li>\n<li>Fluid applied \u2013 simplifies detailing and assures a monolithic, seamless membrane when applied to a rough or smooth surface.<\/li>\n<li>Excellent adhesion \u2013 remains firmly bonded to the substrate, even when applied over damp surfaces.<\/li>\n<li>Self-sealing \u2013 Nails and fasteners can be used without compromising performance.<\/li>\n<\/ul>\n<p><strong>PACKAGING<\/strong><\/p>\n<p>18.9 Litre Pails<\/p>\n<p><strong>COVERAGE<\/strong><\/p>\n<p>Gypsum, OSB, Plywood: \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1.7 m<sup>2<\/sup>\/L (80 ft.<sup>2<\/sup>\/gal.)<br \/>\nWet and Dry Film (Cured) Thickness:\u00a0\u00a0\u00a0\u00a0\u00a0 20 mil (0.51 mm)<\/p>\n<p>CMU, Masonry: \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1.5 m<sup>2<\/sup>\/L (60 ft.<sup>2<\/sup>\/gal.)<br \/>\nWet and Dry Film (Cured) Thickness:\u00a0\u00a0\u00a0\u00a0\u00a0 27 mil (0.68 mm)<\/p>\n<p><a class=\"button\" href=\"https:\/\/www.wrmeadows.com\/app\/\" rel=\"noopener\" target=\"_blank\">Coverage Calculator<\/a><\/p>\n<p><strong>SHELF LIFE<\/strong><\/p>\n<p>When stored indoors in original, unopened containers at temperatures between 4\u00b0 &#8211; 27\u00b0 C, optimum performance and best use is obtained within one year of date of manufacture.<\/p>\n<p><strong>SPECIFICATIONS\/STANDARDS<\/strong><\/p>\n<ul>\n<li>2020 National Building Code of Canada.<\/li>\n<li>Exceeds NABA maximum air permeance requirements when tested in accordance with ASTM E2178.<\/li>\n<li>Exceeds NABA maximum assembly air leakage requirements when tested in accordance with ASTM E2357.<\/li>\n<li>Complies with Canada VOC Concentration Limits for Architectural Coatings Regulations.<\/li>\n<\/ul>\n<p><strong>TECHNICAL DATA<\/strong><\/p>\n<table class=\"table\">\n<tbody>\n<tr>\n<td width=\"173\">Color:<\/td>\n<td width=\"138\">Green<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Solids (ASTM D2369)<\/td>\n<td width=\"138\">99%<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Water Vapor Permeance<br \/>\n(ASTM E96, Procedure B)<\/td>\n<td width=\"138\">15 Perms<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Service Temperature:<\/td>\n<td width=\"138\">Not to exceed 80\u00b0 C<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Elongation (ASTM D412)<\/td>\n<td width=\"138\">638%<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Tensile Strength (ASTM D412)<\/td>\n<td width=\"138\">0.69 MPa (100 psi)<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Nail Sealability (ASTM D1970)<\/td>\n<td width=\"138\">Pass<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Water Penetration<br \/>\n(ASTM E331)<\/td>\n<td width=\"138\">Pass<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Water Resistance<br \/>\n(ASTM D2247)<\/td>\n<td width=\"138\">Pass &#8211; No blistering or other deleterious effects<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Peel Adhesion to Concrete (ASTM C794)<\/td>\n<td width=\"138\">\u22655.0 pli<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Adhesion \u00a0(ASTM D4541M)<br \/>\n(Concrete, CMU, Fiberglass Faced Exterior Gypsum Board, Untreated Plywood, Steel)<\/td>\n<td width=\"138\">\u226510.11 MPa (6 psi)<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Low Temp Flexibility<br \/>\n(ASTM D522)<\/td>\n<td width=\"138\">Pass &#8211; No surface change<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Storage Temperature<\/td>\n<td width=\"138\">4\u00b0 &#8211; 26\u00b0 C<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Air\/Substrate Temperature<br \/>\n(At Time of Application):<\/td>\n<td width=\"138\">&gt;-4\u00b0 C and rising<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">VOC Content:<\/td>\n<td width=\"138\">26.7 g\/L<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Crack Bridging (ASTM C1305)<\/td>\n<td width=\"138\">Pass<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>AIR LEAKAGE<\/strong><\/p>\n<table class=\"table\">\n<tbody>\n<tr>\n<td width=\"102\"><strong>Test Method<\/strong><\/td>\n<td width=\"108\"><strong>ASTM E2178<\/strong><\/td>\n<td width=\"102\"><strong>ASTM E2357<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"102\">Pressure<\/td>\n<td width=\"108\">75 Pa<br \/>\n(1.57 lb.\/ft.<sup>2<\/sup>)<\/td>\n<td width=\"102\">75 Pa<br \/>\n(1.57 lb.\/ft.<sup>2<\/sup>)<\/td>\n<\/tr>\n<tr>\n<td width=\"102\">ABAA Requirements<\/td>\n<td width=\"108\">0.02 L\/S\/M2<br \/>\n(0.004 cfm\/ft.<sup>2<\/sup>)<sup>\u00a0 <\/sup><\/td>\n<td width=\"102\">0.2 L\/S\/M2<br \/>\n(0.04 cfm\/ft.<sup>2<\/sup>)<\/td>\n<\/tr>\n<tr>\n<td width=\"102\">AIR-SHIELD STPE Results<\/td>\n<td width=\"108\">0.0013 L\/S\/M2<br \/>\n(0.0006 cfm\/ft.<sup>2<\/sup>)<sup>\u00a0 <\/sup><\/td>\n<td width=\"102\">&lt;0.003 L\/S\/M2<br \/>\n(0.001 cfm\/ft.<sup>2<\/sup>)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>All technical data provided is typical and subject to variation due to testing methods, site conditions, temperature, curing conditions, and operator technique. Statistical differences in test results should be expected. On-site testing results may not directly correlate with published data due to these variables.<\/p>\n<p><strong>APPLICATION<\/strong><\/p>\n<p><strong>Surface Preparation \u2026 <\/strong>All surfaces must be dry (no visible surface water), clean, and free of dust, frost, ice, grease, oils, dirt, curing compounds, release agents, coatings, sealers, or any other surface or embedded sealers or contaminants that may adversely affect adhesion. Substrates must be structurally sound and relatively smooth.<\/p>\n<p>For concrete, minimum concrete cure time is three days at 24\u00b0 C.\u00a0 Blistering may occur if applied in direct sunlight, especially during the heating part of the day if the internal moisture content of the concrete is not less than 5%, or the relative humidity is not below 75%. Concrete may be highly absorbent and could require additional material to achieve the specified dry film thickness.<\/p>\n<p>Metal surfaces, especially those that are rusted, oxidized, or contaminated, may require sanding or mechanical abrasion. Exposed steel should be abrasive blasted and vacuumed clean. If abrasive blasting is not feasible, degrease the surface and abrade with sandpaper or a wire brush until rust, oxidation, or contamination is removed.<\/p>\n<p>All wall assemblies receiving AIR-SHIELD STPE must be properly capped to prevent moisture infiltration during construction.<\/p>\n<p><strong>Exterior Sheathing Panels &#8230; <\/strong>Exterior sheathing panels are to be installed and fastened per manufacturer\u2019s recommendation.<\/p>\n<p><strong>Rough Openings &#8230; <\/strong><a href=\"https:\/\/can.wrmeadows.com\/en-ca\/air-shield-liquid-flashing-membrane-canada\/\">AIR-SHIELD LIQUID FLASHING<\/a> from W. R. MEADOWS is compatible with AIR-SHIELD STPE for rough openings, window flashing, and other related applications.<\/p>\n<p>Sequence of flashing membrane should occur prior to AIR-SHIELD STPE applications.\u00a0 In select locations where this sequence cannot occur, <a href=\"https:\/\/can.wrmeadows.com\/en-ca\/air-shield-butyl-flashing-canada\/\">AIR-SHIELD BUTYL FLASHING<\/a> may be used as a flashing membrane after fully cured and solvent-wiped locations of AIR-SHIELD STPE have been identified.<\/p>\n<p><strong>Concrete Masonry Unit (CMU) \u2026<\/strong> Before applying AIR-SHIELD STPE to CMU surfaces, patch all cracks, protrusions, small voids, offsets, details, irregularities, and small deformities with <a href=\"https:\/\/can.wrmeadows.com\/en-ca\/meadow-patch-5-cementitious-repair-mortar-canada\/\">MEADOW-PATCH<sub>\u00ae<\/sub> 5<\/a> or <a href=\"https:\/\/can.wrmeadows.com\/en-ca\/meadow-patch-20-fast-setting-cementitious-repair-mortar-canada\/\">MEADOW-PATCH 20<\/a> from W. R. MEADOWS at least two hours before application.<\/p>\n<p><strong>Temperature\/Conditions \u2026<\/strong> Drying (curing) times are dependent on air temperature, airflow, relative humidity, substrate temperature, wind chill, dew point, etc.\u00a0 For example, as the temperature decreases, the dry time will increase and the time to achieve rain resistance will be extended. If the temperature drops below 5\u00b0 C, dry time (cure rate) and resistance to precipitation and dew will be delayed. Protect membrane from precipitation and washout prior to drying.\u00a0 Exposure to air temperatures &lt;-4\u00b0 C during drying may lead to decrease of performance.<\/p>\n<p>Typical Dry Times:<br \/>\nTack-Free Time: \u00a0\u00a0 3 hours at 24\u00b0 C &amp; 50% RH<br \/>\nDry Time:\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 48 hours at 24\u00b0 C &amp; 50% RH<\/p>\n<p><strong>Roller \u2026<\/strong> AIR-SHIELD STPE can be applied directly from the container; a 19.1 mm (\u00be\u201d) nap roller is recommended.\u00a0 Apply AIR-SHIELD STPE on a vertical surface, in multiple coats if necessary, to achieve a final film thickness based on substrate type stated under COVERAGE.\u00a0 NOTE:\u00a0 While the proper film thickness may be achieved with a single coat, multiple coats may be necessary if the material slumps due to temperature and\/or substrate conditions.\u00a0 Allow each previous coat to dry (approximately one hour) prior to applying the next coat.<\/p>\n<p><strong>Sprayer \u2026<\/strong> AIR-SHIELD STPE should be stored and maintained at a temperature of 16\u00b0 C or higher throughout the entire spray application.\u00a0 Note:\u00a0 Use of Graco GH833 is recommended for optimum performance.\u00a0 A Graco heavy duty texture gun with either a 0.051\u201d (Graco GHD 551), 0.035\u201d (Graco GHD 535), or 0.037\u201d (Graco GHD 537) spray tip is recommended.\u00a0 If cratering occurs, the GHD 535 or 537 is recommended for a smoother finish.<\/p>\n<p>Spray AIR-SHIELD STPE on a vertical surface, in multiple coats if necessary, to achieve a final film thickness stated under COVERAGE.\u00a0\u00a0 NOTE:\u00a0 While the proper film thickness may be achieved with a single coat, multiple coats may be necessary if the material slumps due to temperature and\/or substrate condition.\u00a0 If the profile is highly rough and porous, two coats applied perpendicular to each coat will be required to ensure a uniform and continuous film has been achieved.\u00a0 Allow each previous coat to dry two hours prior to applying the next coat.<\/p>\n<p><strong>Film Thickness \u2026<\/strong> Frequently inspect the surface with a wet film gauge to verify that proper film thickness is achieved and that the film thickness is uniform over the entire surface.\u00a0 Porous substrates, masonry blocks, etc., may require multiple coats to achieve recommended film thickness.<\/p>\n<p><strong>Cleanup \u2026<\/strong> Material should not be left in the pump, lines, or gun when finished spraying.\u00a0 After spraying, flush aromatic solvents, such as mineral spirits, xylene, or toluene, through the system until pump and hose are clear (approximately two gallons).\u00a0\u00a0 Do not flush with water.<\/p>\n<p><strong>LIMITATIONS\/PRECAUTIONS<\/strong><\/p>\n<p>DO NOT FREEZE. Keep containers tightly sealed. Maximum UV exposure period is twelve months; after 12 months, reapplication will be required. Tack, PSA, and spray adhesives (such as tapes and sheet membranes) will not bond well since this material is silyl-terminated polyether based.\u00a0 For optimal performance, apply AIR-SHIELD STPE over existing waterproofing membranes or over STPE-based sealants or detailing mastics such as AIR-SHIELD LIQUID FLASHING or <a href=\"https:\/\/can.wrmeadows.com\/en-ca\/bem-canada\/\">BEM<\/a>.\u00a0 AIR-SHIELD self-adhered rubberized asphalt flashings as well as <a href=\"https:\/\/can.wrmeadows.com\/en-ca\/pointing-mastic-canada\/\">POINTING MASTIC<\/a> from W. R. MEADOWS should not be applied over AIR-SHIELD STPE.\u00a0 Silane and hybrid sealants in general will adhere well to cured AIR-SHIELD STPE. Always confirm compatibility and adhesion with manufacturer of sealant prior to install.\u00a0 It is recommended that the roof is installed prior to the application of the AIR-SHIELD STPE.\u00a0 This will help avoid water from getting behind the backup wall or filling the CMU block, which can potentially lead to jobsite concerns. Do not apply AIR-SHIELD STPE if precipitation is forecast or imminent within two hours at 24\u00b0 C and 50% RH of application.\u00a0\u00a0 Adhesion of membrane on oriented strand board (OSB) and treated lumber can sometimes be affected by the level of surface texture, presence of wax or level and type of treatments.\u00a0 Prior to placement on OSB or treated lumber, in-situ adhesion tests should be performed to determine suitability of substrate prior to full installation.\u00a0 If there are variations in the OSB surface, multiple tests may be required.<\/p>\n<p><a href=\"https:\/\/can.wrmeadows.com\/green-line-products\/\"><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"27820\" data-permalink=\"https:\/\/can.wrmeadows.com\/en-ca\/hydraset-free-canada\/greenline\/\" data-orig-file=\"https:\/\/can.wrmeadows.com\/wp-content\/uploads\/greenline.jpg\" data-orig-size=\"427,168\" data-comments-opened=\"0\" data-image-title=\"greenline\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/can.wrmeadows.com\/wp-content\/uploads\/greenline.jpg\" class=\"alignnone size-full wp-image-27820\" src=\"https:\/\/can.wrmeadows.com\/wp-content\/uploads\/greenline.jpg\" alt=\"\" width=\"427\" height=\"168\" srcset=\"https:\/\/can.wrmeadows.com\/wp-content\/uploads\/greenline.jpg 427w, https:\/\/can.wrmeadows.com\/wp-content\/uploads\/greenline-300x118.jpg 300w, https:\/\/can.wrmeadows.com\/wp-content\/uploads\/greenline-250x98.jpg 250w\" sizes=\"auto, (max-width: 427px) 100vw, 427px\" \/><\/a><\/p>\n<p>2026-04<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/can.wrmeadows.com\/pics\/foot-can.jpg\" alt=\"\" width=\"640\" height=\"98\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/can.wrmeadows.com\/pics\/footer-can.jpg\" alt=\"warranty\" width=\"614\" height=\"212\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>AIR-SHIELD STPE is a fluid-applied, vapour-permeable air and moisture barrier designed to help control air leakage and water intrusion in wall assemblies. This single-component, moisture-cured membrane goes on easily by spray, roller, or brush and dries to form a seamless, flexible layer that stays durable over time without becoming brittle.<\/p>\n","protected":false},"author":1,"featured_media":73817,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":"","jetpack_post_was_ever_published":false},"categories":[129],"tags":[],"class_list":["post-73815","post","type-post","status-publish","format-standard","has-post-thumbnail","category-air-barriers-fluid-applied-en-ca","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.1 (Yoast SEO v28.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>AIR-SHIELD STPE (Canada) - Fluid-Applied, Moisture-Cured, Vapour Permeable Air Barrier - W. 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