slopes for roof deck substrates

Types of Roof Membranes for Flat or Low-Slope Roofs

Technically we are talking about low-slope roofs that have a slope less than or equal to 3:12. You can read our article about calculating slope for information on the various roof slope notations . The minimum slope for a flat roof is 1/4” per foot or 1/4:12 but some owners or insurance companies require a minimum slope of 1/2” per foot.

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Minimum Slope Requirements for Metal Roofs & Choosing the

According to the 2012 International Building Code (1507.4.2 Deck slope) minimum slopes for roof panels need to comply with the following: The minimum slope for lapped non-soldered seam metal roofs without applied lap sealant shall be three units vertical in 12 units horizontal (25-percent slope).

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Chapter 15: Roof Assemblies and Rooftop Structures 2017 FBC

Roof slopes from two units vertical in 12 units horizontal (17-percent slope) and less than four units vertical in 12 units horizontal (33-percent slope). Apply a 19-inch (483 mm) strip of underlayment felt parallel to and starting at the eaves fastened sufficiently to hold in place.

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Roofing Design Requirements - DFCM

sloped to drain back on the roofing system. The top of all parapets are to be structurally sloped to drain back onto the roof and structurally supported by a wood nailer. 10. All roof wall substrates are to be a wood or primed roof board suitable for adhering the roof wall flashings as approved by the roofing system manufacturer. 11.

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Soprema SBS Membrane Installation Guidelines - RCABC Roofing

Slope range: from dead-level (except single-ply) up to and including vertical; the choice of membrane combination and its suitability to a particular slope is governed by the type of deck insulation and fastening capability application method perceived stresses on the membrane and its required finish; please consult Soprema for assistance

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Complex Sloping Steel Roof Issues - RMSCA.ORG

ridges perimeter framing and transitioning slopes in the roof planes. See Figure 1.2 – Sloped Roof Plan View. Properly established work points will define the limits of the architectural envelope into which the steel framing must fit and allow the steel detailer to accurately detail all the individual members of the sloped roof system. B.

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Decking Recommendations for Built-Up Roofing and Modified

The Asphalt Roofing Manufacturers Association (ARMA) recommends that the structural roof deck meet certain minimum requirements to be an acceptable substrate for the specified roofing system. Generally all decks should be clean dry and securely fastened to the building structure with no abrupt level changes exceeding 1/8”.

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Steep-Slope Roof System | USG

The USG Structural roof system consists of steel joists trusses or framing members and USG Structural Panel Concrete Roof Deck applied with mechanical fasteners to serve as a structural substrate Shingles clay tiles and standing seem metal roofs.

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Low-Slope Metal – Insurance Institute for Business & Home Safety

MCA Metal Roof Installation Manual (Chapter 6 Roof Deck Substrates and Chapter 10 Roofing Design) 2.17 Photovoltaic and Solar Installations. Low-slope SSRs provide the optimal foundation for photovoltaic (PV) and solar installations since the roof is expected to last longer than the system it supports.

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Slope roof deck - can this be done in section view

Or you can have no varying layer and then you get a custom-shaped roof defined point by point! Finally if you want a sloped insulation and a flat deck on top of it (traditionnal decking technique) you will have to draw two objects on top one another: 1- your roof with the sloped waterproofing. 2- a slab that is only your decking!

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Measuring Roof Slope and Pitch - InterNACHI®

Metal roof panels should be installed on roof slopes according to particular seams (2015 IRC R905.10.2): minimum roof slope of 3:12 for lapped nonsoldered-seam metal roofs without lap sealant applied; minimum roof slope of 0.5:12 for lapped nonsoldered-seam metal roofs with lap sealant applied

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Bituminous Built-Up Roofing Systems | Buildings

Suitable substrates that provide such stability include well-attached shear-resistant insulation boards and stable roof decks both nailable or non-nailable. On nailable decks such as wood Oriented Strand Board (OSB) plywood and structural wood fiber a nailed base felt is first applied to the deck bridging deck joints in order to

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Metal panel roof - National Roofing Contractors Association

spaced roof deck. These assemblies typically are designed to be weatherproof. Structural metal panel roof assem - blies generally are used for low-slope applications. Chapter 1—Structural Substrates applies to all metal panel roof system structural substrate types and addresses several key metal panel roof assembly design consider - ations.

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GAF RoofPro Underlayment Application Instructions

5. Examine the deck or substrate… make sure the surface is clean dry and free of debris. 6. Examine the deck and/or substrate for defects or damage… repair where necessary. Note: Gaps in the deck greater than 1/4” (6mm) require 32 ga. sheet metal overlays nailed at 3” o.c. (76mm). 7. Check for proper under-deck ventilation…

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Low-slope Roof System Types - Roof Asset Learning Center

For metal panel roof systems the NRCA recommends a minimum of one (1) layer of No. 30 asphalt-saturated felt on roof decks with a slope of 4:12 (18 degrees) or more and a minimum of two (2) layers of No. 30 for roof slopes of 3:12 (14 degrees) up to 4:12. Underlayment should be applied horizontally in shingle fashion.

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Metal panel roof systems for low-slope applications

For roof decks having slopes of 3:12 (14 degrees) up to 4:12 (18 degrees) a minimum of two layers of No. 30 asphalt-saturated underlayment should be applied horizontally in shingle fashion. In locations where the average temperature for January is 30º F or less NRCA suggests installation of an ice-dam protection membrane.

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Decks Over Roofs | JLC Online

Roof installation keys. For the roofing that goes under a rooftop deck we’ve developed a set of installation procedures (see “Low-Slope Roofing Details That Work” Nov/19). First we use a heat-seamed membrane—almost always TPO (thermoplastic polyolefin)—because the joints don’t require regular resealing unlike the glued joints of

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Hunter Panels Low Slope Roofing Products - Flat

Achieves a UL Class A combustible deck assembly rating without the use of a fire rated slip sheet or gypsum cover board when applied at a thickness of 1" or greater. Insulation joints must be staggered a minimum of 12" from the combustible deck joints. Maximum roof slope = ½”:12” UL Class A FM Class 1; Mold resistant facer

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Roofing Systems | WBDG - Whole Building Design Guide

When used on steep-slopes the system's fire resistance may be reduced and/or special precautions may be needed when used on steep-slopes. Plaza Decks and Vegetated Roofs. Low slope roofing is sometimes accomplished by using a Plaza Deck or an Extensive Vegetative Roofs. Built-up Roofs (BUR)

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I The NRCA Roofing and Waterproof- ing Manual Fifth Edition

Steep-slope roof assemblies typically are composed of a roof covering un-derlayment insulation (covered by a nailable substrate if installed on top of a roof deck) and roof deck. Com-pact or warm roof assemblies incor-porate insulation directly above or below roof decks (see Figure 1). Ven-tilated or cold roof assemblies have

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Building a Roof Over a Deck | Mr. Handyman

It works well for long and narrow decks but not for deep decks because of the slope required. 2. Gable Roof. The most common type of deck roof the gable roof forms a triangular shape projects along a ridge down the center of the deck and overhangs the enclosed space. This significantly sloped deck roof allows for proper drainage of rain and

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RubberGard Design Guide - BuildSite

B. Sloped Roofs - Asphalt Vapor and Air Barrier Systems Table 1.09-2 Approved Immediate Deck Substrates for Single-Ply Membranes Up to and Including 20-Year

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Keeping up with steep slopes | Professional Roofing magazine

When asphalt shingle roof systems are applied on substrates with less than a 4:12 (18-degree) slope NRCA currently recommends the installation of a single layer of ASTM D1970-compliant self-adhering -modified bitumen sheet underlayment as well as taking specific additional steps during the roof system design process. ASTM D1970

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A Complete Guide to Commercial Flat Roofing Systems

Today’s variety of flat or low slope commercial roofing options (roof pitches ranging from ¼:12 to 3:12) is no longer simple and has grown considerably in the last 50 years. The goal of this article is to help building owners architects and contractors decide which commercial roofing options are right for each unique project.

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Proper roof slope and drainage are important to prevent

long straight runs of deck.” For steel roof deck attachment to the underlying roof structure welds or mechanical fasteners typically are used. SDI and FM Global provide two generally recognized but somewhat differing guidelines applicable to the attachment of steel roof decks. The specifics of steel roof deck attach-

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Roof Decks - RCABC Roofing Practices Manual

Tapered slope insulation products can only be used to provide slope if any differences from level in the roof deck are less than the percentage of slope provided by the insulation. A minimum slope of 1:50 (1/4" in 12") is strongly recommended.

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Roof Pitch Calculator | Pitches To Angle Chart

The picture below shows the pitch of a 7-12 roof slope meaning that for 12" of horizontal measurement (roof run) the vertical measurement (roof rise) is 7". This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

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1 Exam Prep NRCA Roofing Manual: Steep-Slope Roof Systems

1 Exam Prep – NRCA Steep-Slope Roof Systems - 2013 3 Page # Highlight 17 "Asphalt shingle roof systems may be applied directly to the following roof deck substrates: (2 bullets)." 18 1.1 Wood Panels. "Wood-panel roof decks can be subdivided into two general types: plywood roof decks and oriented strand board (OSB) roof decks."

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Commercial Roof Substrates Overview | Choice Roof Contractor

Non-structural metal roofing requires a solid substrate beneath it typically plywood oriented strand board or a metal roof deck. Structural metal roofing is broken down into low slope and steep slope categories. Low slope products are available for roof pitches from 1/4:12 to 3:12 while steep slope products are designed for roof pitches greater than 3:12.

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Building a floating deck on an epdm rubber roof surface

Thanks for the info. I am in the same situation with a deck over an enclosed pool. The only thing is that my deck is about 1200 square feet over epdm. Unfortunately we don't have great slope on the surface. From the house to the edge of the deck is about 28 feet and about 52 feet across. I'm not sure what materials to use.

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Substrate & Assembly Details - Roof & Deck Waterproof

For any exterior tile deck project from a small landing to an expansive flat roof deck its long term success depends on best practice standards for the assembly. Choosing reliable products that are suitable for the project’s specific needs and are compatible with each other is a big part of that.

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Substrate Boards - Roofing

Substrate boards are often placed on the roof deck and a vapor retarder installed upon them. This condition is often used to temporarily get the building “in the dry”. This temporary roof then is often used as a work platform for other trades such as masonry carpentry glazers and ironworkers to name a few.

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Minimum Roof Slopes Required by Roofing Material | EXPLAINED

Minimum Roof Slope (Roof Pitch) | R905.2.2. Asphalt shingles can only be installed on roof slopes of 2:12 or greater. This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units. Also if Asphalt shingles are installed on a roof slope of 2:12 to 4:12 it shall be provided with a double underlayment application.

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Substrate for Green Roofs | Growing Green Guide

SUBSTRATE INSTALLATION . On large green roof projects growing substrates can be installed by crane or by ‘blower’. Substrate may be delivered in multiple bulker bags typically of one cubic metre capacity although a larger crane lifting bags of greater volume may be possible if site access permits.

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ULTRAPLY™ TPO ROOFING SYSTEMS

Table 1.06-5 Acceptable Fasteners for Concrete Roof Decks Table 1.06-6 Acceptable Insulation Adhesives for Insulation Attachment to Structural Concrete Roof Decks Table 1.06-7 Single-Ply Adhesion/Attachment to Wood Roof Decks Table 1.06-8 Acceptable Fasteners for Plywood and OSB Roof Decks

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