Metal Roofing with the Appearance of Traditional Materials · 2019-03-26 · Metal Roofing with the Appearance of Traditional Materials More variety and more sustainability is now

Metal Roofing with the Appearance of Traditional Materials

More variety and more sustainability is now available for new and renovated residential and light commercial projects.

Continuing Education Credit

• CertainTeed Saint-Gobain is a Registered Provider with the American Institute of Architects Continuing Education Systems. Credit earned upon completion of this program will be reported to CES records for all AIA members. Certificates of Completion for non-AIA members are available upon request.

• This program is registered with AIA/CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.

This course qualifies for:

1.0 AIA Learning Units - HSW credit.

1.0 GBCI Continuing Education Hour

Learning Objectives

After completing this presentation you should be able to:

1. Identify and recognize the high performance characteristics of metal roofing (wind and weather resistance, fire classification and durability) as determined by national standards.

2. Investigate the design potential and innovative opportunities to use metal roofing in a variety of profiles and colors to create sustainable buildings.

3. Assess the functional contributions of metal roofing as part of the green and sustainable design of a building.

4. Specify metal roofing in a variety of green and conventional buildings selecting from a variety of choices and options.

Basis of Presentation

This course is based on a continuing education course that originally appeared in Architectural Record magazine.

Metal Roofing with the Appearance of Traditional Materials

More variety and more sustainability is now available for new and renovated residential and light commercial projects.

Provided by: CertainTeed Saint-Gobain

Written by: Peter J. Arsenault, FAIA, NCARB, LEED-AP

Overview• Metal roofing provides: Long term durability, Enduring appearance,

Sustainability, Strong return on investment

• Metal roofing is a large part of US roofing industry at over $4 billion annually and forecast to be over $7 billion by 2024

• More choices now available including those that mimic look of traditional materials including clay tile, slate roofing, or wood shakes.

• Course will address current choices, options, characteristics and green properties

Overview

Overview• Metal roofing provides: Long term durability, Enduring appearance,

Sustainability, Strong return on investment

• Metal roofing is a large part of US roofing industry at over $4 billion annually and forecast to be over $7 billion by 2024

• More choices now available including those that mimic look of traditional materials including clay tile, slate roofing, or wood shakes.

• Course will address current choices, options, characteristics and green properties

1. BUILDING DESIGNS WITHMETAL ROOFING

2. PERFORMANCECHARACTERISTICS OF METALROOFING

3. GREEN BUILDING

4. SPECIFYING TRADITIONALAPPEARANCE METALROOFING

5. CASE STUDY

6. CONCLUSIONS

AGENDA

1. BUILDING DESIGNSWITH METAL ROOFING

• Standard Metal Roofing Types• Standing Seam• Corrugated Metal• Stone Coated

• New Types of Metal Roofing• Clay Tile • Slate Tile• Wood Shake

AGENDA

Standard Metal Roofing Types

Standard metal roofing comes in three common types:

– Standing seam– Corrugated profile– Stone coated panels

However all have some limitations for residential and light commercial projects

Standing Seam Metal Roofing

• Defined pattern of clean lines with concealed fastening

• Appearance limited to standard solid color

• Not commonly consistent with residential, or traditional historical design

Corrugated Metal Roofing

• Corrugation adds strength and allows for weathertight overlap

• Typically less expensive and associated with agricultural and industrial buildings

• Colors limited to solid or “bare metal” galvanized

• Exposed fasteners influence appearance and leak potential

Stone Coated Metal Roofing

• Provides different colors or textures

• Batten system may be needed which adds cost

• Stone coating means algae growth may occur, requiring some ongoing maintenance

Demand for “Traditional” Metal Options

• Designers have requested durable metal roofing products that can provide the appearance of more traditional and historic buildings

• Manufacturers have responded with at least three options (Tile, Slate, Shake)

Clay Tile Roofing in Metal

• Metal roofing panels in a tile profile provide a new and improved option

• Provide the appearance of clay tiles but without the weight and breakage concerns of clay

• Available in a range of colors with the look of natural clay.

Slate Tile Roofing in Metal

• Slate roofing is a regional traditional favorite

• Metal panels can be pressed to create depth and patterns that match the look of slate roofing tiles

• Full range of colors are available that reflect the natural and varied colors of slate in different regions

Wood Shake Roofing in Metal

• Wood shakes are common traditional roofing

• Recreating the look of shakes in metal provides deep profiles to create shadow lines along the edges

• Available in a range of colors reflecting the natural weathered colors of wood.

2. PERFORMANCE ANDCHARACTERISTICS OFMETAL ROOFING

TOPICS:

• Metal Roofing General Performance

• Metal Roofing Compared to Traditional Materials

• Dispelling Some Myths About Metal Roofing

AGENDA

Metal Roofing General Performance

• Weight: – Metal roofing is lighter in weight

than other roofing – Less weight means less roof

structure needed• Weather Resistance:

– Wind ratings against blow-off up to 130 MPH

– Impact resistance from hail and other impacts; UL 2218 tested to achieve Class 4 rating – highest available

• Algae resistance:– Metal is inherently algae resistant

Metal Roofing General Performance

• Fire Classification: – Metal roofing meets Class A rating

reducing fire concerns and insurance premiums (FR,DD)

• Finish Options: – A range of finishes from bare

galvanized metal to fade resistant coatings (PVDF)

– “Cool roof” finishes also available for LEED, ENERGY STAR, and California Title 24 compliance

Metal Roofing General Performance

• Durability: – Metal roofing often outlasts the

building

– Galvanized steel resists rust and corrosion

– Proven durability allows for warranties of 50 years or more

All of these general performance traits of metal roofing are inherent in all products regardless of profile or appearance

Metal Roofing Compared to Traditional Materials

• Clay tile, slate tiles, or wood shake roofing can be directly compared to metal roofing

• Provides the same appearance but with the performance attributes of metal

Metal Compared to Clay Tile

Comparison: – Clay tile weighs 700 – 1100

per sq vs. 98 per sq for metal

– Clay tile requires extra structural support and is more costly to install

– Clay pigments fade, metal PVDF doesn’t

– Clay can crack, metal remains unblemished

– Clay doesn’t meet solar reflectance – metal can

Metal Compared to Slate Roofing

Comparison: – Slate weighs 600 – 800 per sq vs.

96 per sq for metal

– Slate tile may require extra structure

– Slate can crack, chip or get damaged while metal remains intact

– Slate doesn’t meet solar reflectance

Metal Compared to Wood Shakes

Comparison: – Shakes vary in weight vs.

predictable 96 sq for metal

– Shakes can shrink, warp, and split

– Shakes have 20 – 25 year life; metal 50 years or more

– Metal provides reflectivity and recyclability

Dispelling Myths about Metal Roofing

• Any building material that has been in common use often generates stories without being validated by facts.

• Three things in particular that seem to be misunderstood.

Dispelling Myths about Metal Roofing(Noise from Rain)

• Rain makes noise only if there is nothing below metal

• Sheathing and insulation dampen sound

• Tested levels equal quiet conversation –52 db

Dispelling Myths about Metal Roofing (Rusting)

• Older, unfinished metal may have rusted

• Current products use multiple coatings over galvanized steel that resist rust and deterioration

Dispelling Myths about Metal Roofing (Lightning)

• Some people perceive that metal roofs attract lightning

• Metal roofs are no more prone to lightning strike than a metal car

• Tall trees are more likely to be struck

3. GREEN BUILDINGWITH TRADITIONALMETAL ROOFING

TOPICS:• Sustainable Sites• Energy and Atmosphere• Materials and Resources

AGENDA

Sustainable Sites (SS)

• Natural areas reflect and disperse sunlight

• Urban areas with dark colored surfaces absorb sunlight and turn it into heat creating “urban heat islands”

• Impact can raise surrounding air temperature by as much as 5 degrees Fahrenheit

Sustainable Sites (SS)

• All materials will absorb and/or reflect solar radiation

• ASTM E903 and E892 are tests used to determine solar reflectance (SR) of materials– Black paint = SR of 0– Bright white = SR of 1

• Solar Reflectance Index (SRI) measures ability of materials to stay cool in sun – higher SRI, higher amount of reflection– Black surface = SRI of 0– White surface = SRI of 100

Sustainable Sites (SS)• Metal roofing can achieve high

SRI values– Minimize heat– Reduce urban heat islands

• Contributes to LEEDv4 credit:– Steep slope roof (greater than

2:12): manufactured SRI = 39 min.; aged SRI = 32 min.

• Manufacturers can provide SRI test result data

Energy and Atmosphere (EA)

• Specifying a “cool roof” can have a direct impact on the building’s energy use and interior environment

• Metal roofing system with a proper slope is often used as an ideal base to support solar panels

• These factors can help model reduced energy use in the building or contribute to the design of an onsite renewable energy system

Materials and Resources (MR)

• A LEED prerequisite is to reduce the amount of construction and demolition waste by recycling, recovering, or reusing building materials

• Any excess or scrap steel is recyclable at the factory

• Metal roofing contains a substantial percentage of recycled content

Materials and Resources (MR)

• A Life Cycle Assessment (LCA) is used to support LEED MR credit

• Manufacturers use an Environmental Product Declaration (EPD) to show impacts at all stages of life of product– raw materials to product

delivery– raw materials to end of life

4. SPECIFYINGTRADITIONALAPPEARANCE METALROOFING

• Specification Process • Install Checklist • Maintenance Review

AGENDA

Specification Process

• Communicate with the Manufacturer through the entire process

• Identify scope of metal roofing work: – Preparation– Substrate review– Products Installation

• Review the performance tests and standards

Specification Process

• Submittals: – Manufacturer’s data– Samples– Color and texture

information• Quality Assurance:

– Trained, experienced installers

• Protection of Products– Follow manufacturer’s

recommendations

Brick Blend

Jade

Terracotta

Tuscan Stone

Weathered Canyon

Weathered Sage

Weathered Terracotta

Weathered Sequoia

Specification Process

All metal roofing products need to be called out• Basic products:

– Type, size, and shape• Performance:

– Weight limits, wind resistance, impact resistance and fire classification

• Finish:– Specific color and texture or

pattern– Minimum SRI for solar reflectance

Specification Process All related roofing system components need to be specified• Metal items:

– Trim, accessories, fasteners, metal flashing, etc.

– Ridge vent or caps• Underlayment:

– Identify specific type and location

– Assure compatibility with metal roofing

• Quote the job accurately – Use Manufacturer’s job quote

tools– Consider your labor (takes

longer than an asphalt install)

Installation Checklist

• Install crew watches all the installation videos (if available)

• Install crew reads entire install manual

• Install crew foreman has a written copy of the install guide on site throughout the job for reference

• All the tools listed in the install guide should be on site throughout the install

• Manufacturer’s Trainer (if one is offered) has the opportunity to review the material list against the roof spec to confirm the correct material will be on site

Maintenance Review

To ensure the continued performance of the metal roof, homeowners or a contracted service should perform the following surface-level maintenance tasks on the roof.

• CLEAN OFF DIRT, MILDEW, STAINS, AND OTHER ELEMENTS

• CLEAN OUT GUTTERS AND DRAINS

• REMOVE LEAVES OR DEBRIS STUCK IN VALLEYS AND OTHER DEAD SPOTS

• REMOVE BRANCHES OR STICKS TOUCHING THE ROOF SURFACE

• ENSURE NO OTHER METALS OR MATERIALS ARE TOUCHING THE ROOF

• LOOK FOR SCRATCHES, SCUFFS, CHIPPING, FLAKING, OR EXCESSIVE CHALKING/FADING

AGENDA (case study)

• Project: Villanova Home

• Location: Suburban Philadelphia, Pennsylvania

• Type: Residential Remodel

5. Case Study

Case Study

The Project:• Main Line is

affluent suburb of Philadelphia

• Luxury homes are common

• Realtor/owner wanted to transform water damaged home

Case StudyThe Challenge:

• Original slate-look asphalt shingle was not in line with California inspired vision for remodel.

• Owners considered composite roofing material but were hesitant due to reviews and aesthetic concerns

Case Study

The Solution:• Spanish mission

look of tile was selected for remodel

• Metal roofing with look of clay was selected for performance

• Choice added to home value

Case StudyHomeowner Response:• “My first thought was that it

is very visually appealing”

• “Sustainability is important, and this roofing is very energy efficient. The high solar reflectance will keep us cooler in the summer and it’s wonderful knowing that the entire roof is recyclable.”

• “The roof is a major design element, and around here a good roof is expensive, so why wouldn’t you go for something better?

Case Study

The Results:“I am very happy with the end result. It’s a very complex roof with a lot of different roof slopes. I think it looks nicer than real tile with a great pattern and texture, and when the sun comes out it really highlights the coloration of the roof.”

6. CONCLUSIONS

AGENDA

Conclusions

• Metal roofing is no longer limited to corrugated or standing seam profile panels

• All of the appealing performance benefits are available in metal roofing products with traditional appearance such as clay tile, slate tiles or wooden shakes

• These contribute to great design, easier construction and low maintenance

• They bring green and sustainable qualities to the buildings they are installed on

Metal Roofing with the Appearance of Traditional Materials

THANK YOU for participating

This concludes the AIA Continuing Education program