What is tapered roof insulation used for?
Our high performance tapered roof insulation is suitable for use in a range of flat roofs, including both new builds and refurbishment projects. Our tapered roof insulation eliminates the need for a structural fall which is great for both specifiers and installers.
How does tapered insulation help with water ponds on the roof?
Depending on how much water ponds on the roof and how long it stays there, solutions are usually developed to help promote drainage. One of the most common solutions is tapered insulation. But how does tapered insulation work?
Why choose GAF tapered insulation design?
Rely on your dedicated GAF tapered insulation design specialist for detailed, high-quality solutions that can help you deliver on every project. See how common tapered layout designs help drive rain water to the roof drains to promote positive drainage.
What are the different types of tapered insulation codes?
Tapered Insulation Codes and Compliances » ASTM C1289, Type II, Class 2, Grade 2 (20 psi), Grade 3 (25 psi) » International Building Code (IBC) Section 2603 » UL Standard 790, 263 and 1256: Component of Class A Roof Systems
What is the R value of tapered insulation?
Letting H equal the thickness (or R-value) at the high point of tapered insulation and L equal the thickness (or R-value) at the low point of tapered insulation, this assumed average thickness (or R-value) is (H + L)/2.
What is ISO tapered insulation?
SOPRA-ISO TAPERED is a sloped polyisocyanurate thermal insulation board. It is composed of a closed cell polyisocyanurate foam core between organic facers reinforced with glass fibres. SOPRA-ISO TAPERED is designed to promote positive drainage and used as thermal insulation for SOPREMA roofing systems.
What is a tapered roof system?
A tapered roof system is where the slope or 'pitch' of the roof is formed by the insulation where the roof is flat, to allow water to drain off. Tapered polyisocyanurate roof insulation or tapered iso for short, is made from the same ridge foam material that normal polyiso roof insulation is made from.
How do you install tapered roof insulation?
1:484:36How to Install Tapered Roof Insulation - How to Get Slope on a Flat RoofYouTubeStart of suggested clipEnd of suggested clipAs you can see we've got all our three inch fill we've got two mechanically fastened down and whatMoreAs you can see we've got all our three inch fill we've got two mechanically fastened down and what we're gonna do now we're gonna come in and lay in our taper. We're gonna do that low-rise foam.
What is the R-value of ISO board?
For the R-value of polyiso wall insulation, a full thickness, 180 day aged value is recommended. Foilfaced polyiso has an R-value of about 6.5 per inch and permeability faced polyiso wall insulation has an R-value of around 6.0 per inch.
What is the R-value of 2 inch ISO board?
R-11.6ISO R-Value Thickness ChartPolyiso Thickness:R-Value:1.5 Inch PolyisoR-8.72 Inch PolyisoR-11.62.5 Inch PolyisoR-14.53 Inch PolyisoR-17.424 more rows•Jun 13, 2022
Why tapered insulation is used on the roof deck?
Tapered insulation systems can help reduce or eliminate the amount of ponding water on the roof when the structural roof deck does not provide adequate slope to drain.
What is flat roof insulation?
What is flat roof insulation? Flat roof insulation is used to enable a room to feel warmer in the winter and cooler in the summer months. Wood fibre, cellular glass and polystyrene (EPS or XPS) all have good insulation properties, but foam works particularly well and is often found in modern constructions.
How do you install flat roof insulation?
2:174:03How does efficient flat roof insulation work? Concepts from a construction ...YouTubeStart of suggested clipEnd of suggested clipFirst the substrate is dried where necessary. The near poor insulation boards can then be laidMoreFirst the substrate is dried where necessary. The near poor insulation boards can then be laid directly on top they're stable lightweight. And easy to cut to size and fit into place.
How thick is tapered insulation?
Tapered polyiso panels are manufactured in standard 4-foot by 4-foot sizes with a minimum thickness of ½-inch at its low edge and maximum thickness of four inches for a single board. A flat polyiso underlayment board, often referred to as flat fill, is used beneath continuing, repeating tapered panels.
How do you find the slope on an existing flat roof?
If you need to increase the overall slope of the flat roof you can either raise the end near the pitched roof or lower the end away from the pitched roof. The former would typically be easier (you build a low-pitch roof on top of the flat roof) but this assumes that you can tie into the shingles on the pitched roof.
How do you slope a flat roof for drainage?
For drainage purposes, the current building codes require a minimum two percent slope or a one-fourth unit vertical for every 12 units horizontal. In other words, the roof must slope one-fourth of an inch for every 12 inches. The slope is barely noticeable to the naked eye.
How thick is tapered insulation?
Tapered polyiso panels are manufactured in standard 4-foot by 4-foot sizes with a minimum thickness of ½-inch at its low edge and maximum thickness of four inches for a single board. A flat polyiso underlayment board, often referred to as flat fill, is used beneath continuing, repeating tapered panels.
How do you measure tapered insulation?
In order to determine the average system R-values for a tapered insulation project, the average thickness for the insulation system must first be determined. This is calculated by dividing the total volume of insulation (the board footage) by the area of insulation coverage (the square foot area).
What is InsulFoam made of?
InsulFoam FL (Flute-Filler) is a custom-made, engineered insulation consisting of a superior closed-cell, lightweight expanded polystyrene (EPS).
What is the R value of rigid foam board?
Extruded polystyrene: Extruded polystyrene (XPS) rigid foam is usually blue or pink in color, with a smooth plastic surface. XPS panels typically aren't faced with other material. The R-value is about R-5.
What is Tapered Insulation?
Tapered insulation is a popular method of creating both thermal performance and falls within a roof, all in one go. Rather than applying screed, firrings or tilting the deck, tapered insulation is a cost and time efficient method achieving the same effect.
How many falls does tapered insulation have?
Tapered insulation is traditionally produced at 1:60 falls, and because it is manufactured the tolerances are very tight. However, where two 1:60 falls meet, in a valley for example, the valley fall will be shallower, running the risk that the scheme will potentially fail to meet the recommended 1:80 across the whole roof.
What is the fall rate for flat roofs?
BS 6229 recommends that all flat roofs should be designed with a fall of 1:40 to ensure a 1:80 fall is achieved once the roof is completed. This design criteria includes internal gutters and should take account of construction tolerances, settlement, and for deflection under load, both during and post construction.”
What is a cut to falls roof?
On new build flat roofs, falls can be placed in the structure, in a screed or using firrings, or in the insulation itself – a “tapered scheme”, also known as ‘cut to falls’ insulation. Tapered schemes can also be used in refurbishment projects such as overlays, as long as there is an assessment and survey of the existing roof to establish how best to work with the existing conditions.
What is the minimum value of a tapered scheme?
On tapered schemes this requires that the thinnest part of the scheme is set at a minimum 0.35 W/m 2 K U-Value.
How many W/M 2 K on a roof?
No part of the roof including gutters, sumps and outlets, to exceed 35 W/m 2 K.
What is the minimum W/m2K required for a roof?
In addition, BS 6229:2018 requires that no part of the roof should exceed 0.35 W/m2K:
Tapered Insulation – How Does It Work?
On buildings designed with little to no roof pitch (i.e., slope to direct water toward drains, scuppers, etc.), or older buildings that may have settled over time, ponding water can be an issue. Depending on how much water ponds on the roof and how long it stays there, solutions are usually developed to help promote drainage.
Complicated Roof
The last step is to complete the installation itself. The goal is always to stick as close to the design as possible, making small field changes as necessary to reflect actual conditions. On tapered insulation projects, a skilled contractor and installation crew is vital, because small mistakes early on can lead to dramatic problems down the road!
How many pieces of tapered roof insulation?
There are three main pieces of a tapered roof insulation package that are designed to work in conduction with one another. The names of the panels are after the last three letters of the alphabet X, Y, and Z. The size of the insulation is as at the following:
How thick is an X panel?
This means that for every foot of distance the iso get 1/4 “thicker. For example an X panel begins at 1/2” thickness and increases a 1/4” in thickness every foot. Since the piece of iso is 4’ long, the thickness increase will be equal to 1/4” times 4 or a rise of 1” over the 4’ distance ( 1/2 to 1 /12” )Flat roofers can then arrange ...
Is a tapered iso board flat?
Regular iso board comes in flat sheets and in several different thicknesses. Tapered iso is not flat but is made with slope or “fall” and also comes in several different thicknesses but with slope. The slope causes water to move downhill on what would be an otherwise is a flat roof surface.
Is tapered roof insulation cheap?
But for all the great things tapered roof insulation is, cheap is not one of them. Adding a tapered insulation package will substantially increase the price of a flat roofing project. Understanding what tapered roof insulation is, how it works, and the basics of installation will help you make the most of your flat roofing investment.
