1. Preparation & Safety

Safety First

Install edge protection or scaffolding
Wear gloves, safety glasses and soft soled footwear
Avoid working in wet or windy conditions

Tools

Tape measure, chalk line, level, square
Electric tek screwdriver with suitable driver
Sheet cutting tools: hand shears or nibblers (avoid hot swarf damage)

Materials

Sheets (0.5mm for wall cladding, 0.7mm for Roof cladding)
Primary fixings with EPDM washers
Side-lap stitchers
Butyl mastic tape
Foam fillers and flashing (ridge, verge, eaves)

2. Measuring the Roof

Pitch

Measure rise over a 1.0 mtr run and calculate degrees

Slope Length

Eaves to ridge, add 50 - 70 mm overhang

Roof Width

Divide total width by 1.000 mtr to calculate sheet quantity required

Obstructions

Note flues, rooflights or valleys

3. Sheet lengths & Laps

Use single-length sheets where possible

For lengths over 8-10mm use end laps

Minimum pitch after deflection: 4° with no end laps 6-10° for lapped sheets

Apply two beads of mastic at all end laps

4. Substructure Preparation

Ensure purlins are straight and correctly spaced (1.000mtr - 1.375mtr for 0.5mm and up to 1.800mtr for 0.7mm)

Install membrane if specified

Set a straight eaves line with a string

5. Setting Out

Start from the verge away from prevailing wind

Chalk a straight line for the first sheet's edge

Allow 30-50mm verge overhang

6. Installing the First Sheet

Postion with correct eaves overhang

Ensure square to the steel frame

Tack in place before full fixing

7. Fixing Pattern

Fix through the trough into every purlin at eaves and ridge

Alternate trough at intermediate purlins

Side-lap stichers every 300-500mm

End laps: fix every trough at the lap purlins

8. Laying Additional Sheets

Apply mastic on the side-lap

Align and engage fully

Stitch as you go and maintain alignment

9. Flashings & Closures

Eaves: Fit foam fillers on mastic

Ridge: Ridge fillers with mastic, overlap ridge flashings by 150-200mm and seal with gun grade mastic

Penetrations: Use EPDM pipe flashings

10. Finishing Touches

Remove all swarf immediately

Touch up only small cut edges of flashings

Check fixings, flashings and overhangs

11. Maintenance

Annual inspection for fixings, washers and sealants

Clear gutters and clean the roof

Quick Example

Roof: 3.800mtr slope, 6.200mtr wide pitch 10°

Sheets: 7 sheets (6.200mtr ÷ 1.00mtr cover)

Length: 3.860mtr (includes overhang)

Purlins: 1.165mtr centres

Fixings per sheet: 20 primary ÷ side-;ap stitchers

Tips

Start square and away from the wind
Use unbroken mastic beads
Don't overlap fixings
Don't leave swarf on the roof

An excellent family company to deal with. From our initial call to getting all the materials to site I couldn't fault them. They've been incredibly knowledgeable and has been a pleasure to work with. We would definitely recommend. Kit Whittaker

This was my first order with your company, and it certainly wont be my last. From our initial enquiry to delivery everything went smoothly. Once again i must say thanks for your excellent service. John Smithies

“Just purchased some roofing sheets and fixings. Very reliable and efficient company. Even the delivery driver was very helpfull. Would not hesitate to use them again.” Lynda Misseldine

I was extremely pleased with Tinman Steels Ltd. The product that I purchased (box profile roof sheets) was great quality and exceeded my expectations. In addition, the customer service was absolutely first class, of high standard and with very helpful communication. A faultless experience from beginning to end - I'd definitely recommend this company! Ross Marriott

A great and genuine family run business. I’ve tried lots of different suppliers over the years and eventually stuck with these guys. They are also able to produce custom made flashings. James Hule

34/1000 Roof Cladding: Step-by-Step Installation Guide