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3. Open Valley Shingle Installation
An open valley relies on an Armourvalley membrane or metal flashing for protection. Armouvalley and metal flashing are left exposed, so these materials stay visible on the roof. Some homeowners do not like the look of metal (flashings) in the valley. Therefore we offer the Armourvalley roll which is matching the color of the shingles. Open valleys with laminated shingles have many advantages. One of the advantages is better drifting of water to the gutters, reducing the risk of ice dams or blockages of debris. Especially low slope roofs (9,5°- 20°) are good candidates for open valleys because they are more likely to accumulate debris. Experience learns that if the shingles are installed properly, performing properly, the open valley system holds up better over the time.
Quick guide how to install an open valley:
- Snap two chalk lines from the ridge to the eaves 8 cm apart increasing in width by 1 cm per meter towards the eaves.
- Trim the shingles to these lines and cut a 5 cm triangle off the top corner to direct the water into the valley.
- Nail the shingles 5 cm back from the chalk line.
- Do not use a shingle trimmed to less than 25 cm in length to finish a course running into a valley.
- If necessary, trim a part off the adjacent shingle in the course to allow a longer portion to be used.
- Glue the valley end of each shingle with bituminous mastic.
- There should be no exposed nails along the visible part of Armourvalley.
4. Our most favorite method:
It is the easiest, most money and time effective method!
IKO tip & trick for the Cambridge shingles:
One variant of the open valley is the “Californian valley”. In our community it is also called “Cambridge valley” because this valley is only possible to do with laminated or Cambridge shingles. For this method, the last shingles on both “cut” sides of an open valley are actually installed sideways, so they run up and down the valley parallel with chalk-lines.
This saves the time of cutting shingles and is the fastest way to shingle a roof valley.
Remember:
A properly installed valley is a critical component of any roof, ensuring the long-term protection of this vulnerable area. IKO’s recommendation is to install laminated shingles, or architectural shingles, using the open valley method, for best roof performance.
Interested in the product mentioned in this blogpost?:
Do you have an extention at your house with a low roof slope that is connected to a standard roof slope? Or are you planning to add an extention of a winter garden, an open-air kitchen or a garage to your existing shingle roof? Let us show you how to install a low slope roof and extended flat roof that is connected to a shingle roof with a standard slope.
First some basic information:
Standard shingles can be used on roof slopes from 15° to 85°. If the slope of your extension is higher than 15°, you can install any type of shingle you prefer or use the one that is installed on your existing main roof. Take a look at our roofing tutorial, which shows the installation of any type of IKO shingles.
If the roof slope of the extension is between 9,5° and 15°, then Cambridge Xtreme 9,5° is what you are looking for. This aesthetic laminated shingle can be installed on slopes from 9,5° up to 90°. For such a low slope installation, the roof deck has to be made of OSB boards of at least 22 mm thick. On this roof deck IKO Armourbase Pro PLUS or Armourbase STICK underlayment needs to be installed. Then install the roof according to the general installation instructions for the Cambridge Xtreme 9,5° shingles. The change of roof pitch between the low and higher slope should be made with metal flashing.
