Single Covertec

Specifications

How to choose Screws and bolts

Points to check when selecting, with the values for this product (4.5×55).

1. 1. Select a type that suits the substrate

   Drill screws are used for steel substrates, S-cut tip or double-thread screws for wood substrates, and dedicated lift-prevention tip products for existing slate or shingle roofs. Each substrate type has a different structure. Confirm the existing roof construction and substrate material before selecting.

2. 2. Check the drillable sheet thickness for steel substrates

   Drill screws have an upper limit on drillable steel sheet thickness. Listed products have an upper limit of 3.2 to 4.5 mm and a lower limit of 1.6 mm. Confirm that the thickness of the substrate steel, such as purlins, falls within this range, and also check tip specifications such as pilot length of 12 mm and cutting blade outer diameter of 3.4 mm.

3. 3. Length suited to the total thickness of stacked materials

   This product: Grip length (max.) 30 mm

   Re-roofing construction passes through the new roofing, existing roofing, insulation and other layers, so confirm the maximum clamping thickness. The maximum clamping thickness of the listed product is 30 mm. Some are available in series lengths such as 90 to 150 mm. Select a length that allows sufficient engagement into the substrate beyond the total thickness.

4. 4. Check nominal diameter and pitch

   This product: Nominal diameter d 4.5 mm

   Listed products have a nominal diameter of 4.5 to 6.3 mm and a pitch of 1.8 to 2 mm. A larger diameter gives greater holding power but also affects the hole diameter in the substrate and roofing. Also confirm the manufacturer's specified size and compatibility with the bits and drivers used for installation.

5. 5. Compare pull-out and shear strengths

   Roofs receive uplift forces from wind suction. Listed products show values of 5.9 kN in steel substrates, 2.5 kN in wood substrates, up to 600 N in structural plywood substrates, and maximum shear of 1200 N. Use the values for each substrate in calculating the required design strength and the number of fasteners.

6. 6. Washer material and outer diameter for waterproofing

   Washers are available in stainless steel with gasket, low-cost steel types, and others, with outer diameters of 25 mm and 20 mm. Select based on roofing profile, the area to be pressed, the risk of rainwater infiltration, and dissimilar metal contact with the roofing material. Some products are supplied as the body only without a washer.

This guide was written by AI based on the listed products' documents and specification items.

About Screws and bolts and all products

Description

The tip design suppresses lifting of existing roofing material and secures strength in the rafter section. The large-diameter, low-profile Shin Washer head firmly holds the new roofing material.

FAQ

Q. Can Single Covertec 4.5×55 be used for metal roof cover construction over existing decorative slate or single-layer roofs?

A. It is used for metal roof cover construction over existing decorative slate roofs and over single-layer roofs. It features a special tip that prevents lifting of the existing roofing material.

Q. What are the roles of the special tip and Shin Washer head of Single Covertec 4.5×55?

A. The special tip prevents lifting of existing roofing material during driving. The large-diameter, low-profile Shin Washer head firmly holds the new roofing material.

Q. What are the nominal diameter, length, fastening thickness, and pilot length of Single Covertec 4.5×55?

A. Nominal diameter d is 4.5 mm, and nominal diameter × length is 4.5×55 mm. Pilot length is 12 mm, and maximum fastening thickness is 30 mm.

Q. What are the surface treatment and packaging quantities of Single Covertec 4.5×55?

A. It is a steel screw with trivalent chromate-free zinc plating. The BOX quantity is 150 pieces, and the outer carton quantity is 10 BOXes.

Written by AI based on the content of the source documents.

Source documents

• Catalog カバーテック 屋根改修システム用ねじ Roof Fastening System 2 pages
  Found on: https://www.jpf-net.co.jp/ebook.html