Why is ACQ pressure-treated wood becoming more common?
On January 1, 2004 the Environmental Protection Agency (EPA) has banned the use of Chromated Copper Arsenate (CCA) as a preservative in treated lumber in residential and commercial construction. This was in an effort to reduce the use of arsenic and increase the safety level. Alkaline Copper Quanternany (ACQ) is a non-arsenic wood preservative that has become the treated lumber industry's answer to this EPA requirement.
What effect does the ban of Chromated Copper Arsenate (CCA) have on the metal fasteners used on roof edges?
While effective as a wood preservative, ACQ pressure-treated lumber has an increased copper component. These chemicals are more corrosive to common steel according to American Wood Preservers Association
(AWPA) test results.
Is the metal that Metal-Era uses safe to use with ACQ treated wood?
Metal-Era is committed to long lasting, quality products, and the following quick facts demonstrate that our metal edges are designed to be safe with ACQ treated wood.
- Any Kynar© painted material in steel or aluminum is chemically inert and can be used in direct contact with ACQ pressure treated wood.
- The galvanized steel sheet use by Metal-Era is a hot dipped galvanized steel sheet produced on continuous coating line, by passing raw steel through a bath of molten zinc. Metal-Era galvanized steel has a G-90 coating (1.25 oz. per square foot), and can be used in direct contact with ACQ wood.
- All Anchor-Tite Systems use an extruded aluminum bar to terminate the roof edge. The membrane is covering the treated wood nailers, due to water proofing issues before the installation of the extruded aluminum bar. The extruded bar does not come in direct contact with ACQ, therefore, there is no reaction.
- Mill finish aluminum should not be used in direct contact with ACQ treated lumber. Spacer materials or other physical barriers are recommended (i.e. rubber, felt, etc.) to prevent direct contact of ACQ pressure-treated wood and mill finish aluminum products.
- Metal-Era recognizes the importance of using non-corrosive, code compliant fasteners. All Metal-Era Anchor-Tite products carry a Lifetime, 215 mph wind warranty, and therefore require the fasteners to be provided by Metal-Era. Metal-Era has changed all specifications to only provide stainless steel fasteners.
Metal-Era also provides private labeled metal edge products for roof membrane manufacturers (Carlisle, FiberTite, Firestone, GenFlex, Johns Manville, Koppers, Stevens, US Ply and Versico
). All fasteners are provided as part of their full system warranty program. All private label specifications have been changed to provide stainless steel fasteners and hot-dipped, ring shank galvanized nails.
What are the ACQ fastener requirements?
2003 International Residential Code - Fastener Statement, Section R319.3: “Fasteners for pressure-preservative treated wood shall be hot-dipped galvanized steel, stainless steel, silicon bronze or copper. Exception: One-half inch (12.7 mm) diameter or greater steel bolts.”
Electroplated galvanized fasteners are not recognized as being corrosion resistant for exterior applications.
What recommendations are there for managing the corrosive effects of ACQ pressure treated wood?
- For long-lasting roof edges, specify nails which conform to the ASTM A-153 specification for hot-dipped galvanizing.
- Specify stainless steel screw fasteners.
- Aluminum should not be used in direct contact with ACQ treated lumber.
What is ANSI?
The American National Standard Institute
(ANSI) is a non-profit organization that administers and coordinates a voluntary standardization system.
What is SPRI?
The Single-Ply Roofing Industry
(SPRI) is a sheet membrane and component supplier to the commercial roofing industry. SPRI has worked with the roofing industry to develop consensus industry standards.
What is Factory Mutual Global?
Factory Mutual Global
(FM) provides commercial and industrial property insurance and engineering-driven risk management solutions.
What is ICC & the IBC?
The International Code Council
(ICC) is a non-profit organization that works to develop a single set of comprehensive and coordinated national model construction codes. The International Building Code (IBC) provides a consensus standard for construction codes.
How and when did all these organizations get involved in setting roofing industry standards?
Prior to 1980 there were no roofing edge standards by which manufacturers could hold themselves to. FM then created a system of standards and approvals to use on FM insured properties. The design community adopted this because there were no other available standards at the time.
In 1998 SPRI developed a series of three tests for judging the quality and durability of fascia and coping. These tests then allow for ES-1 approval.
In 2003 the IBC wrote the ES-1 guidelines into their 2003 code. The majority of states and municipalities have adopted the 2003 IBC or a subsequent version making ES-1 compliance crucial.
How can I find code-compliant products?
Metal-Era has developed an easy to use wind calculator
. Just enter a few basic facts about your building project, such as building height and location, and receive the basic wind speed, the needed design pressure and Metal-Era products which meet the design pressure.
What does the IBC require of roof edge systems?
The 2007 IBC, §1504.5: "Edge securement for low-slope roofs. Low-slope membrane roof system metal edge securement, except gutters, shall be designed and installed for wind loads in accordance with Chapter 16 and tested for resistance in accordance with ANSI/SPRI/FM 4435/ES-1, except the basic wind speed shall be determined from Figure 1609."
The ANSI/SPRI/FM 4435/ES-1 document can be downloaded in its entirety for free from SPRI.
Why has Metal-Era become involved in ES-1 testing and which Metal-Era product lines have been tested?
Metal-Era’s commitment to long-lasting, quality products has made it vital that we ES-1 test all product lines. The testing provides customers the piece of mind to know that they are not liable for a building code violation. Specifically, the following product lines have been ES-1 tested (please check with your sales rep for the latest information): Anchor-Tite, Perma-Tite, Systems 200, 300, 400 and 500 fascias; Perma-Tite and Anchor-Tite copings
; and Metal-Era's private label partners (Carlisle, FiberTite, Firestone, GenFlex, Johns Manville, Koppers, Sika Sarnafil, Stevens, US Ply and Versico) full system warranty
product lines. If you have a specific building project, you may use Metal-Era's easy to use wind calculator
. It quickly calculates the basic wind speed, the needed design pressure and Metal-Era products which meet the design pressure.
What does the incorporation of the ES-1 Standard into the IBC mean for me? Do you have any recommendations?
ES-1 tested products assure a long-lasting, quality product. It is important to frequently check your local requirements because additional states, counties and municipalities are in the process of adopting the IBC. Understandably, it can be difficult and sometimes confusing to keep track of each locality's requirements, so to play it safe and avoid the risk of not coming up to code, specify ES-1 tested roof edges.
What are the benefits of proper ventilation?
- Extends the life of shingled roofs by minimizing the temperature differential between the attic air and the outside air. It keeps the roof system cool during the hot summer months, preventing premature deterioration and less shingle replacement.
- Extends the life of metal roofs systems by preventing moisture from condensation that develops on the underside of the roof, ultimately causing rust & other structural problems.
- Prevents ice damming caused when the heat from inside the building and the sun melts the snow at the ridge. This causes water to run to the eaves and refreeze and the repetition of this process causes ice dams.
- Provides energy savings in the summertime by cooling the roof sheathing, preventing premature roof deterioration, premature roof replacement and increased servicing of cooling units due to their excessive use. It prevents heat build-up in unvented systems which radiates downward and increases the demand on cooling systems.
- Provides energy savings in the wintertime by preventing hot and cold air to interact and cause moisture from condensation that causes soaked insulation, corrosion and water infiltration.
What are the problems associated with ice damming?
Ice damming can cause damage to roof coverings, fascia and gutters. Structural damage can occur as a result of the weight from the ice and water pooling inside the dam infiltrates under the shingles, damaging or destroying the shingles. The insulation can absorb water that has pooled from openings caused by ice dams, which causes the R-value to drop and creates an environment for mold, mildew, spores and fungi which can cause health problems.
How can I guard against ice dams?
- ▪ Proper insulation
- ▪ Underlayments
- Use a waterproofing shingle underlayment
- Provides a waterproof barrier under the shingles
- Prevents water infiltration from pooled water from the ice dams
- ▪ Proper Ventilation
- Creates a cold roof system so the temperature of the roof sheathing is close to the outside temperature
- Large amounts of outside air need to be taken into the roof system at the eave and exhausted at the ridge
- Use our Above Sheathing Ventilation Calculator to help determine the amount of airflow required in your ventilation nailbase system or use our NFA Calculator to determine the proper NFA for attic ventilation.
How do thermal effects impact ventilation?
Warm air rises and cool air descends, therefore, cool air will naturally enter the system through lower eave vents and warm air will naturally exhaust through high ridge vents. A well circulated and balanced system takes advantage of this natural thermal effect.
How does wind impact ventilation?
Wind speed as it moves against and over a building is key rather than the wind’s velocity. This creates high and low pressure zones (Bernoulli’s Principle). High pressures force air into the attic at the eave, while ridge vents create a baffle, causing low pressure to draw air from the ridge and prevent rain and snow from entering the attic.
What is NFA?
Net free area (NFA) is the portion of the opening in the vent that actually ventilates; the total unobstructed area through which air can enter or exhaust a non-powered vent. To calculate the needed NFA for your attic system, use our NFA Calculator
What characteristics are unique to commercial ventilation?
- Larger structures
- Longer runs (eave & ridge)
- Larger surface area of the roof
- Lower pitches
- Larger heating and cooling systems, often placed in the attic
What recommendations are there for attic ventilation?
Install vents with a balance system of net free vent area. Take into consideration the stack effect, air movement caused by wind and by temperature differences. As a rule of thumb, for every 1” of exhaust air have greater than or equal intake and ensure that you have a balanced system.
What ventilation product recommendations do you have?
Ventilation is only as good as the amount of airflow that is allowed in and out of the system. Most products on the market are designed for residential homes which require lower NFA ratings, which are inadequate for large, commercial roof systems. Most of these products provide inadequate ventilation after a 30’ run and most products provide inadequate ventilation after 75’ widths. Make sure that the products you select will provide proper ventilation for longer runs and widths. To help determine the amount of airflow required in your ventilation system, use our Above Sheathing Ventilation Calculator for ventilated nailbase systems or our NFA Calculator for attic ventilated systems.
What is a full system warranty?
A full system warranty (also called a total system warranty) helps limit your liability should there be a problem with the roof system. It will provide repairs for any qualifying leak in the roofing system caused by:
What is covered under a full system warranty?
The full system warranty can cover, if specified:
- Membrane & Membrane Accessories
- Metal Edging & Coping
What is the history behind a full system warranty?
Membrane manufactures have recognized the importance of ensuring that their membrane is properly attached to the roof. Without a quality roof edge, the entire roof system is at an increased risk. In order to be able to fully guarantee that the membrane will function as intended, it is necessary that the roof edge will last just as long, if not longer than the membrane.
How do I specify a full system warranty?
Specification is easy, but careful consideration must be given to ensure that there are no loopholes. The following are 5 must haves for a full system specification:
- Be sure Section 7710 or 7620 and 7500 are both cross-referenced in their respective "Related Sections" section.
- Be sure metal fascia and coping are specifically stated in Section 7710 or 7620 and 7500, Part 1 General, Quality Assurance, Warranty paragraph, as included as a warranted component of the entire roof assembly.
- In Section 7500, Part 2, Products, specify the respective brand names of the fascia and coping systems for the specified membrane manufacturer(s). This is typically after the walkway pads paragraph.
- In Section 7710 or 7620, Part 1, General, Quality Assurance, specify that the fascia and coping shall be tested and designed to withstand wind pressures for that building as calculated by using the ANSI/SPRI ES-1 document.
- In Section 7710 or 7620, Part 2, Products state all of the material gauges and finishes and the installation execution for metal edge products specified in Section 7500. This section would be related to the products specified in 7500.
Which membrane manufacturers offer a full system warranty through Metal-Era?
Full system warrantees are offered through: Carlisle, FiberTite, Firestone, GenFlex, Johns Manville, Koppers, Sika Sarnafil, Stevens, US Ply and Versico.
What does Miami Dade approval mean?
For a product to be Miami-Dade approved means that the Miami-Dade Building Code Compliance Office has reviewed and tested the product and it meets specific criteria for construction in Miami-Dade County, Florida.
Why should non-Miami-Dade County projects care if a product has been Miami-Dade approved?
Miami-Dade County is subject to some of the harshest wind conditions and has developed strict building codes to ensure the quality and durability of the building products used. Products that have been approved to comply with the High Velocity Hurricane Zone of the Florida Building can withstand the strongest winds in the country, which means that those buildings subject to lesser winds can have absolute confidence that their roof edge will remain in place.
How strong is a high velocity hurricane wind?
A product that can withstand "high velocity hurricane winds" can withstand winds with gusts of up to 150 mph. This is why Metal-Era is able offer a Lifetime, 170 mph wind warranty.
Hurricane force winds can cause significant damage, as was shown in the particularly fierce 2004 hurricane season. Take a look at some of the roof damage Hurricane Charley caused on roofs with inadequate edges. For more hurricane or weather related information visit the National Weather Service.
Which Metal-Era products have been Miami-Dade approved?
We offer a wide variety of products that have been Miami-Dade approved. Our complete line of Anchor-Tite fascia, Perma-Tite coping and various other fascia and coping products available through our private label partners.
Which membrane manufacturers offer Miami-Dade approved roof edges through Metal-Era?
Full system warrantees are offered through: Carlisle, FiberTite, Firestone, GenFlex, Johns Manville, Koppers, Sika Sarnafil, Stevens, US Ply and Versico.