O'Brill Company

Construction Specialty Suppliers

       6626 N. Milwaukee Ave.

Niles, IL 60714

773-775-1122 or 847-647-0005

FAX 847-647-7819

Since 1967

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Protection Course




NO. 712


Effectively protects delicate waterproofing systems on vertical and horizontal surfaces.

SEALTIGHT PROTECTION COURSE products are tough, durable, lightweight panels specifically designed to protect delicate waterproofing materials from damage by normal construction traffic, movement of adjacent substrate or backfilling.

SEALTIGHT PROTECTION COURSE is a multi-ply semi-rigid core composed of a mineral-fortified asphaltic core formed between two outside layers of asphalt-impregnated reinforced mats, manufactured in accordance with ASTM D 6506.

When properly applied by personnel trained in good waterproofing techniques, SEALTIGHT PROTECTION COURSE will absorb the impact of aggregate shock and normal jobsite foot traffic. It also protects the membrane waterproofing from penetration by sharp aggregate during backfilling and later settlement.

SEALTIGHT PROTECTION COURSE is available in three types; PC-1, Light Duty; PC-2, Standard Duty and PC-3, Heavy Duty. All three types are economical and convenient to use.

SEALTIGHT PROTECTION COURSE is used in between-slab construction, such as plaza decks, roof terraces, promenade decks, pedestrian concourses, tunnels, floors of bathrooms, showers, kitchens and mechanical rooms, parking garage decks, planter boxes, reflective pools and foundation walls.

SEALTIGHT PROTECTION COURSE is compatible with most currently popular dampproofing and waterproofing materials.

Features and Benefits

bulletTough, durable and lightweight, panels are easily handled, quickly installed
bulletFull width fiberglass matting improves flexural strength
bulletHighly resistant to chemical action
bulletPerformance is equally effective in above or below-grade installations
bulletUnique dual-facing offers compatibility with most currently popular waterproofing materials
bulletEconomical and convenient to use

Application Tools



Roofer's Knife

NOTE: Prior to application, consult the waterproofing manufacturer to determine whether the polyethylene film facing on one side, or the asphalt-impregnated reinforced mat on the other side of SEALTIGHT PROTECTION COURSE is approved as "compatible" to the specific waterproofing product being protected.

SEALTIGHT PROTECTION COURSE is installed to form a continuous protective layer over the membrane waterproofing. The sheets can be easily cut with a roofer's knife for fitting at protrusions.

SURFACE CONDITION: The waterproofing membrane must be free of sharp projections, dirt and dust. If water testing is desired, it should be made prior to placing the protection course. Note: Protection course should be applied at the end of each day's waterproofing to both horizontal and vertical surfaces.

HORIZONTAL SURFACES: PROTECTION COURSE should be installed over the waterproofing membrane as soon as permissible by the membrane applicator or manufacturer. PROTECTION COURSE sheets should be butted together and cut to fit all intersecting surfaces and protrusions. If desired, joints may be covered with SEALTIGHT Detail Strip or roofer's glass reinforced tape embedded in hot asphalt as a secondary waterproofing system. (See Point 2 under Limitations/Precautions).

VERTICAL SURFACES: For dampproofed and/or waterproofed vertical walls to receive backfill, the PROTECTION COURSE should be butt-jointed and, if necessary, temporarily held in place while backfilling.

BACKFILLING: Backfilling against vertical walls should be done immediately using care and caution to avoid damaging the waterproofing application. Backfill material should not be dropped against the PROTECTION COURSE in such a manner that it could drag the sheet down as the backfill drops. For horizontal applications, the waterproofing and PROTECTION COURSE should be installed just prior to the installation of the wearing surface.


4' x 8' (1.22m x 2.44m) panels

Limitations / Precautions
1. Where PROTECTION COURSE is adhered to waterproofing membrane, use the adhesive recommended by the membrane manufacturer.
2. Where taped joints are desired with tape set in hot asphalt, consult membrane manufacturer.
3. PROTECTION COURSE is shipped on pallets with the polyethylene anti-stick sheet on the top or exposed side. PROTECTION COURSE should be stored on the pallets and placed on a level surface.
4. CAUTION: Do not apply the Protection Course over liquid applied waterproofing membranes containing volatile solvents until all of the solvent has evaporated. Consult membrane manufacturer for specific application details prior to placing the Protection Course. Read and follow application information and precautions.

Physical Properties
ASTM D 6506 Protection Board Requirements
  Classes Type 1 Type 2  Type 3 
Puncture Strength

A & B
222 N (50 lbf)
312 N (70 lbf)
365 N (82 lbf) minimum

A & B
1.3 to 1.8mm
(0.050 to 0.070 in.)
2.4 to 3.9mm
(0.095 to 0.155 in.)
5.6 to 7.1mm
(0.22 to 0.28 in.)
Water Absorption

A & B
10% maximum  10% maximum  10% maximum 
Asphalt, % by weight

65% minimum  65% minimum 65% minimum 
Asphalt, % by weight

40% minimum  40% minimum  40% minimum 
Resistance to Decay

A & B
All Types - Meets puncture requirements after completion of test 

PC-1 Light Duty
PC-2 Standard Duty
PC-3 Heavy Duty
62.5 mil-1/16' (1.59mm)
125 mil-1/8' (3.18mm)
250 mil-1/4' (6.35mm)
4' (1.22m)
4' (1.22m)
8' (2.44m)
8' (2.44m)
8' (2.44m)

This material last updated December, 2001.


W. R. MEADOWS, INC. warrants that, at the time and place we make shipment, our materials will be of good quality and will conform with our published specifications in force on the date of acceptance of the order. THE FOREGOING WARRANTY SHALL BE EXCLUSIVE AND IN LIEU OF ANY OTHER WARRANTY, EXPRESS OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ALL OTHER WARRANTIES OTHERWISE ARISING BY OPERATION OF LAW, COURSE OF DEALING, CUSTOM OF TRADE OR OTHERWISE. As the exclusive remedy for breach of this Warranty, we will replace defective materials, provided, however, that the buyer examine the materials when received and promptly notify us in writing of any defect before the materials are used or incorporated into a structure. Three (3) months after W. R. MEADOWS, INC. has shipped the materials, all our Warranty and other duties with respect to the quality of the materials delivered shall conclusively be presumed to have been satisfied, all liability therefore terminates, and no action for breach of any such duties may thereafter be commenced. W. R. MEADOWS, INC. shall in no event be liable for consequential damages. Unless otherwise agreed to in writing, no warranty is made with respect to materials not manufactured by W. R. MEADOWS, INC. We cannot warranty or in any way guarantee any particular method of use or application of the performance of materials under any particular condition. Neither this Warranty nor our liability may be extended or amended by our salesmen, distributors or representatives, or by our distributor's representatives, or by any sales information or drawings.

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Copyright 2002 O'Brill Company
Last modified: August 09, 2004