Questions? We have answers.

You can find some answers to commonly asked questions about Roofinox products below.

Can I solder this material?

 

Yes – Roofinox is manufactured to be soldered! Please refer to our detailed soldering section and instructions for more details.


Is it in the US or does it all come from Europe?



Roofinox is permanently on stock in Allentown, PA. For unusual products or project related productions material will be shipped from the mills in Germany or Austria.


Can this touch other metals without a risk of reaction?



Bimetall or galvanic corrosion needs to be considered. Roofinox stainless steel is generally very easy to use and easily combined with other metals. Please refer to our product specialists if in doubt. One of the most important rules is not to use (galvanised) steel fasteners for our products as this will lead to extraneous rust.


What underlayment do you recommend?



The corrosion resistance of Roofinox products would technically not require an underlayment – but in regard to building codes, regulations and standards an underlayment is required. No specific brand or product is required as long as it meets above mentioned regulations. No structured mat or nylon matrix is needed!


Do I have to use a special solder?

Most commonly tin/lead alloys are used. The tin potion may range from 30% to 50%. The solder may not contain more than 0.5% antimony. These solders, in conjunction with the Roofinox FLM flux, provide optimal gap filling, good wetting and high strengths. With the required soldering temperature of approximately 250ºC, the melting range of this solder is well suited to guarantee good flow characteristics.

In this context we would also like to mention our specific solder section.


Do I have to use a special flux?



We provide Roofinox FLM, a flux specially designed for the Roofinox product range. If you wish to work with your own flux, make sure to use a stainless steel flux based on orto-phosphoric acid. Flux based on hydrochloric acid or containing other chlorides will cause rust and must not be used!


What kind of fasteners do you recommend?



For all applications we recommend the use of stainless steel fasteners only, i.e. rivets or screws. For all normal environments 304 fasteners are suitable, for all highly-corrosive environments please use fasteners made from alloys 316L or 316. For decorative purposes we also supply stainless steel rivets with tin-coating that will patina.


The following answers are only relevant for Roofinox tin-plated (Terne):

What is the difference between your material and traditional terne material?


Roofinox tin-plated (Terne) traditional terne material
Substrate alloy 439 (normal environment)
316L (highly-corrosive env.)
304
Coating alloy 100% Tin 50% Tin / 50% Zinc
Coating process Electroplating Hot-dipping
Solderability Yes (easy) Yes (more difficult b/o Zinc)
Mechanical properties Enhanced malleability Normal
Materoaö Thickness (gauge) .0197″ (25) .0156″ (28) / .0186″ (26)


Why don’t you tin plate 304?



    For roofing applications in normal environments the alloy 439 performs equally well as alloy 304 relative to corrosion resistance. The alloy does not contain nickel which is beneficial to its price and price stability. For highly corrosive environments (e.g. marine application) the alloy 304 is not corrosion resistant enough – for this application we apply the alloy 316L, this will perform as needed and provide higher corrosion resistance.


    Will this material age (patina)?



    Roofinox tin-plated (Terne) will develop an oxide layer – this natural change of the coating layer is called patina. This underlying oxidation process happens over time due to the reaction of oxygen (from air and water) and the material’s tin plating.


    How long does the patina process take?



    Depending on climate, precipitation and environmental influences patina will develop at different paces. In normal North-American, continental environments we have witnessed average durations of 12 to 24 months for the first homogenous patina, which will continue to develop at a slower pace.


    Will the patina continue to get darker?



    The chemical and aesthetic composition of the patina depends on the composition of the environment and the atmosphere the roof is located in. Another major impact is the moment and process of the first weathering cycle – if a roof is weathered partially this will maintain a color difference until patina development is completed. Chemical substances can alter and discolor the surface and patina.


    Will the patina wear off?



    Experience and analysis to date have not shown considerable wear of the oxide layer. It is important not to abrade or clean the oxide layer with abrasives, as this will result in the stainless steel substrate shining through.


    Will the tannins in Cedar shake affect the tin coating either from an aesthetic or functional stand point?



    The color of the tin oxide layer can be affected by tannins of different wood types. Depending on the shape of the roof and the application of Roofinox tin-plated this can lead to darker traces on the material. To date no functional impairment has been reported due to tannins.