Misuse of screws, life change?

Misuse of screws, life change?

Have you ever wondered why there is still a water leak around the screws even though screws with sealing washer under the screws head are used for the buildings (Self-drilling screws have a drill point at the end).

Have you ever wondered why there is still a water leak around the screws even though screws with sealing washer under the screws head are used for the buildings (Self-drilling screws have a drill point at the end).

One of the reasons is how hard the roof installer applied with the screws in order to fix the sheets to the purlins. Using power drill tool with the suitable speed will give the proper capacity which may not split the sealing washer and deform the sheet (see the picture in the middle – correctly driven) and avoid rubber ring to slipIf you tighten screw until the washer is split (see the right picture – overdriven). If you loosen screw then will cause a gap between washer and screws (see the left picture – underdriven). Both overdriven and underdriven can cause water leak around screws and therefore selecting the screws are significant for the life expectant building. 

How to select quality screws

Due to several types of screws, selecting the suitable screws for your design is recommended, please see below for your reference:

1. Screws for roofing

Drive screws through the rib to purlin by using Hex head screw with seal to prevent water leak. The head of the screw is a hex head, and the end of the screw will be the drill point. (Drill point for metal)

2. Screws for walling 

Drive screws to the walling sheet through the valley to frame by using Hex head screw with seal with screw (Hex head with seal) but the screws will be shorter than the roofing.

3. Screws for flashing and louver

Drive Hex head screws and short length

4. Screws for roof accessories clip connector for Boltless and Standing Seam roof system

Drive Wafer head screw which no sealing washer under the screws head (Wafer head with no seal). Besides, Wafer's head screw also applies to ceiling work when does not want the screw head to be seen.

Screws for clip fixing with KS Klipfix39 Roofing

Screws for connector fixing with KS KlipSeam110 Roofing

Screws for clip fixing with KS CozySeam38 Roofing

5. Screws for skylight

Use Hex head screw with a sealing washer (Hex head with seal) and add a Dome Seal Washer separately, the length of the screws depends on the roof profile.

KS Skylight TripleSeam

Installation

Conclusion

Screws are the components for installing steel roofs, walls and ceilings. Refer to the above article, it can be concluded that besides the force controlling to drive the screws, also need to select the suitable quality screws in order to maximize the benefits of the life expectant building.

Thank you for your trust in the use of KS Group products and services.

By KS Group

STP Engineering & Supply Ltd.