This short video explains why the screw placement of the corrugated metal roofing panels should be in the highs of the corrugated panel. When you put the screw in the high or top of the corrugated panel it will be a more weather-tight connection. If the screw goes in the low or bottom of the panel it will be a stronger connection, but will be more likely to leak.
00:00 Do I run screws through the “tops” or through the “bottoms” of the corrugated steel in roofing?
00:29 Why do you put the screws or fasteners on the high or top of the corrugated metal roofing panel?
00:39 Do you put the screws or fasteners in the low or bottom of the corrugated metal roofing panel?
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Screw placement for ⅞” Corrugated
The screw placement for ⅞” corrugated can be a little tricky. The fasteners are located in different locations for roofing and metal siding conditions. Then if that wasn’t confusing enough metal roofing manufacturers have differing opinions on the correct corrugated screw placement for a roofing condition. Hang in there and we will explain this one to you in detail.
There are two schools of thought when it comes to corrugated metal roofing screw placement. Both are correct.
Installing the metal roofing screw in the high of the corrugated panel as shown below. The advantage to this method is the screws are exposed to less water and debris. The main disadvantage is a less secure connection.
If the fastener is placed in the low of the panel it partially obstructs water and debris. The low of the panel is skinny and the fastener takes up most of that space. As the water drains it will go over the screw. Screws that have backed out over time or that were installed incorrectly will leak. You will avoid the bulk of this issue by installing the fastener in the high of the roofing panel.
Screws that are installed in the low of the metal roofing panel will result in a more secure connection, but will be less weathertight. The screw will compress better when attached in the low and you are less likely to distort the metal roofing panel when you tighten the screw.
⅞” Corrugated Screw Location For Metal Roofing
7/8″ Corrugated Screw Location For A 37″ Wide Metal Roofing Panel
A screw line is a row of screws that is spaced at a specific distance from the next row of screws. There will be four screws per screw line placed in the high of the corrugated panel. The screws are spaced out so that every third corrugation has a screw. The diagram above is a typical 37” wide panel and the spacing works out perfectly. However, sometimes corrugated sheets are 39” wide instead of 37” wide. When this happens it creates an additional corrugation. You will still need four screws per sheet, but in one location it will be at the fourth corrugation as shown below.
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