Details and Downloads


The DILA product comes in a wide variety of metal types, the moist common being; galvanized steel, copper, stainless steel, aluminum and zinc titanium. Custom products are possible provided that the amount of product is significant. Please call SITURA for details. The following describes briefly the different types of metals DILA comes in as standard and their uses in construction today.

Stainless Steel

Stainless steel is a durable, corrosion-resistant material. It is often used in harsh environments which would harm other metals or paint finishes. Stainless Steel is an alloy of chromium, nickel, manganese and sometimes molybdenum added for corrosion resistance
For roof applications, 300 series stainless steel material is commonly used. Type 316 stainless steel has molybdenum added, which increases resistance to pitting and corrosion in harsh environments, that is coastal or industrial areas. DILA -Stainless Steel is fabricated from 316 grade steel. It is available in two types of finishes 2B and 2D. The 2B finish is a bright, cold-rolled finish that is highly reflective; 2D is a dull finish that is less reflective and more conducive to soldering. The standard version of DILA Stainless Steel comes in a 2D finish.

Galvanized Steel

Galvanized steel is one of the oldest and most common coated metals. The zinc coating extends the weatherability of the base steel, protecting it as a sacrificial layer from corrosion. The typical referenced standard for roofing application is the so called G-90 which is a coating of 0.90 oz/ft² [275 g/m²] of zinc, total both sides. The coating is a little less than 1 mil [0.03 mm] per side. The zinc coating will oxidize at different rates depending on the environment. Environmental factors include the duration and frequency of moisture contact, the rate at which the surface dries, the saline content of the moisture and the extent of industrial pollution. The more severe the conditions, the more rapid the loss of zinc, which means a more rapid loss of protection. The typical base steel thickness used in roofing is 24 gauge, 0.025” [0.64 mm] in thickness. Galvanized steel has an appearance of random geometric pattern that resembles frost on a window. This finish has a relatively high level of initial reflectivity. DILA-Galvanized uses a minimum G-90 coat, hot dipped to a 24 gauge steel base.


The copper alloy used for roofing is alloy 110, which is 99.9% pure copper. Copper is commonly designated by weight, not gauge. For roofing applications, both 16 and 20 ounces per square foot [4.9 kg/m² and 6.1 kg/m²] copper are common. Copper is one of the more malleable metals because of its softness, copper is not recommended for structural applications. Water runoff from copper can visibly stain light-colored building materials, such as concrete, brick and stone. Copper does not require a protective finish. Copper’s appearance typically changes during its exposure to the elements; however, this change is dependent upon geographic and atmospheric conditions, such as exposure to moisture and air pollutants. Over a period of time, it develops a brown or blue-green color, referred to as patina, resulting from the formation of a protective layer of copper sulfate.


Aluminum develops a thin oxide film on the surface that is impermeable to most airborne contaminants, except for strong alkalies and acids. For this reason, it is not recommended to use aluminum as an in-wall flashing embedded in concrete or masonry, which has a high alkaline content, unless the aluminum is protected by a thick layer of bituminous paint or other material that can isolate it from the contaminant.
Aluminum is a metal alloy that is lightweight and easily formed that does not require protective coatings for most exposures. Aluminum has a substantially higher coefficient of expansion than any other roofing metals. Detailing and attachment must be designed to handle the anticipated thermal movement. The most common aluminum alloy used for flashing metal is known as alloy 3003, It has excellent workability, weldability and corrosion resistance. DILA-Al (Aluminum) is mad e out of aluminum alloy 3003.


Lead (Pb) is used as a roofing accessory metal because of its workability. It is an extremely soft metal, can be formed by hand, typically used in flashing irregular shapes. Sheet lead has little structural strength or puncture resistance and must therefore be installed over solid surfaces, lead roofs typically have a sound wooden substrate. Sheet lead is commonly designated by weight. Lead is soldered. DILA-Lead was developed using 8 pound lead for very special application involving the restoration of historical lead roofs.


The process of attaching the center gland to metal selvage edges is a versatile one, given our experience and technical know how, we are able at SITURA to produce almost any type of metal expansion compensator. Please contact SITURA for details.


Depending on the metal to which the DILA is welded the appropriate material choice would be made. When choosing material the compatibility of metals must be taken into account. Publications relating the corrosive potential to the material type need to be consulted.

The DILAFLEXTM metal expansion joint element comprises of two metal strips joined by a synthetic rubber gland which allows for the movement at the expansion joint. The synthetic rubber gland – or compensator, as it is sometime referred to – is manufactured from highly elastic chloroprene, a high grade elastomer, which has excellent weathering properties. The gland can be ordered covered or exposed depending on the application.

The high quality of the elastomer used in the formulation of the synthetic rubber provides it with superior UV and cold flex (-40°C) properties and resistance to weathering.

A special proprietary manufacturing process bonds the synthetic rubber piece to any metal or alloy (aluminum, copper, galvanized steel, lead, stainless steel, etc.) surfaces. The bond formed is permanent and provides for unmatched waterproofing reliability.

Attachment of the DILAFLEXTM piece can be through soldering or welding, with no special tools or training necessary in order to complete the installation.

Click below to download our product data sheets for the 5 DILAFLEXTM products that are made standard. Custom products are possible, and please contact SITURA for details.



The DILA product comes in 6m (19 ft) rolls. It can be formed to the profile of the gutter with a basic metal break.
Depending on the metal type, the DILA metal compensator is either welded or braced to the gutter at specified intervals to compensate for the movement due to thermal cycling. See the Product Spacing Calculator in the website header.