Interlock® Slate / Cedar Spec Manual

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Interlock® Slate/Shingle Specification Manual

Lifetime Roofing Systems ®

Interlock® Metal Roofing Interlock Slate / Cedar is a four-way interlocking aluminum roofing system. Each shingle is coated with the Alunar® Coating System, which provides a highly durable and attractive surface. A complete range of color-matching trims is provided. An Interlock Roof provides many advantages over conventional roofing:


Saves Energy & Money

Unique design provides incredible strength and protects against severe weather.

Interlock roofs are “Cool Roof” rated and may lower energy costs*. * As per Cool Roof Rating Council (CRRC) and Oak Ridge National Laboratories (ORNL). Contact your Interlock® representative for details.

Curb Appeal Designer colors in a low gloss finish are available.


Environmentally Friendly

Weighs much less than traditional roofing materials.

Sustainable, recyclable, and helps stop roofing material from going to landfills.

Lifetime Limited Warranty Non-prorated, and one-time transferable.

Low Maintenance

Interlock Slate

17 5/8”

Interlock Cedar Shingle


Gauge of material .019” (.48mm) Aluminum base coated with:


Slate / Shingle Panel Detail

9” 17 5/8”


Chimney Collar Is inserted into grooves, cut into the mortar and brick, used in accordance with end wall and side wall trims to create a weather-tight seal around the chimney.

End Wall



Roof Slope

4” 4”

Minimum 3:12 with Ice & Water, 5:12 min with standard underlay.


Side Wall Underlayment

Trusses Cost reductions can be effected in specifying Interlock roof slate, as the weight factor is considerably less than a conventional roof.

Sheathing Sheathing for the roof should be 1/2" minimum or closely fitting boards.

Underlayment The entire roof area should be covered (prior to shingle application) with synthetic roofing underlayment. Depth of each course to weather 9"

Truss Roofing underlayment Sheathing Exterior grade

Interlock Roofing Weighs less than 7% of the average weight of concrete tile roof, and less than 30% of the average weight of asphalt roofing materials. No special preparation is needed, resulting in less structural cost. Note: It is the responsibility of architects, builders and contractors to ensure that all applicable construction bylaws and building codes are adhered to.


End & Side Wall Detail

Ridge Cap Flexible, fits any ridge or hip roof angle. Secured with aluminum fasteners.




Cedar Shingle

0.75" 15.5”

0.75" 15.5”





Design Flexibility May be applied to arched or curved surfaces. Will adapt to almost any roof line.

Roofing Underlayment

1/2” Sheathing Truss

Snow Guards Available in a variety of colors to accent your roof, and are applied during installation.

Approved Truss

Depending upon the slope of your roof, the direction it faces, geographic and weather conditions, you may wish to consider using snow guards. Snow guards are designed to help prevent accumulative snowfall from falling onto areas where such an occurrence is undesirable. The snow guards are manufactured from cast aluminum and are designed to be sturdy and weather resistant.



Starter / Gable Flashing Trim seam locks with Interlock Slate / Cedar. No exposed fasteners.


3 ½”


1” 1 ¾”



1/2” Sheathing

Protruding Drip Cap



Valley Trim Provides smooth, obstruction-free path for precipitation, no projections to catch debris or snow. Panels lock into valley lock on each side.

Interlocking joints 10"


6” 3/4”

Roofing underlayment



End Wall

Side Wall

Used around chimneys, skylights and walls.

Wall surface Building Envelope Exterior finish 4"


End wall Slate or Shingle

1¾” ¾”

2 ¾”

Sheathing Underlayment




Ridge Vents Used around chimneys, skylights and walls.

Shingle Slate



Interlock Slate / Shingle Starter Gable Underlayment Sheathing Ridge Cap Valley Trim Side Wall End Wall Ridge Vent


Testing Reports ICC Evaluation Report 1790 CCMC Evaluation Report 10475-R Florida Report FL 7263 Texas Department of Insurance - Hail Impact UL2218 Class IV

Color Guide Interlock Roofing Ltd. offers a highly durable aluminum roofing product available in a range of different colors, opening up an extensive palette for homeowners and designers. Interlock® roofs are exclusively protected for a lifetime by the Alunar® Coating System.

Solid Copper

Copper Penny

Hunter Green


Deep Charcoal

Musket Grey

Tile Red

Colonial Brown

Tudor Brown

Color and availability may change without notice. Product design and installation technique may vary from represented shown on manual. Installation methods may vary by structure, region, climate, and local building codes. Certain variables and factors specific to your home may inhibit the product’s ability to shed snow. Roofing products and components may change without notice. Please see our website for more information.

Interlock Roofing Ltd.

Interlock Roofing Ltd. 1-866-766-3388 9969 River Way 1-866-766-3388 © 2015 The Interlock Group. Interlock®, Interlock Lifetime Roofing Systems®, Alunar® are registered trademarks of I.E.L. Manufacturing Ltd. and are used under license. Delta, V4G 1M8 TEFLON®BC is a registered Trademark of E.I. du Pont de Nemours and Company used under license. 9969 River Way, Delta, BC V4G 1M8

When installed properly, this product will help reduce energy costs. Actual savings will vary based on geographic location and individual building characteristics. SP20150417

© 2022 The Interlock Group. Interlock®, Interlock Lifetime Roofing Systems®, Alunar®, Never Re-Roof Again.®, and Arrow sign are registered trademarks of I.E.L. Manufacturing Ltd. and are used under license. SP20220308