PROJECT TOOLS

Plan your next project.

Estimate roofing screws, prepare screw lengths or calculate chemical anchor requirements. Start with your site measurements, then share the results with our team.

Need help with the details?Talk to our fastener team

CHOOSE YOUR TOOL

What are you working on?

Measure. Calculate. Confirm with LK.

ROOFING ESTIMATE

How many roofing screws?

Enter your total roof area in sq ft or m². Uses 2 screws per m², with your selected allowance and any additional screws.

2 screws per m² Total roof area × 2, rounded up to whole screws. Square feet are converted to square metres automatically.

01Total roof area

Area unit Total roof area Enter the combined area of all roof slopes in your selected unit.

02Allowance & packaging

Additional screws (optional) Add only quantities already established by the approved layout. Extra allowance Pieces per box (optional)

LENGTH PREPARATION

Prepare a screw-length requirement

Break the roof build-up into measurable layers, then prepare a nominal length and the exact drilling or embedment checks LK still needs.

Roofing system Roof profile / upper build-up (mm) Measure from the screw seating point to the top of the insulation or support layer below. Insulation / PU foam thickness (mm) Use the actual panel or foam-core thickness. Other clamped layers (mm, optional) Support below Steel purlin thickness (mm) This does not select a screw by itself; LK must compare it with the screw’s published drilling capacity. Required fixing allowance below build-up (mm) Use the selected fastener's published requirement for drilling through the support and completing the thread engagement. LK must verify it against the screw.

CHEMICAL ANCHOR QUANTITY

Chemical Anchor Calculator

Plan resin and cartridge quantities for Chem-Granite, Hilti HIT-RE 500 V4, Sika AnchorFix-3030 and other chemical anchors. Select your product to begin.

Chemical anchor product Threaded-rod size (Chem-Granite table) Hole diameter (mm, editable) Recommended table size for M12: 14mm. You can enter a different hole diameter. Embedment / hole depth (mm, editable) Use the specified depth for a rod seated to the bottom of the hole in solid concrete. Number of holes Resin allowance Planning allowance for initial purge, nozzle residue, overfill and site loss. Cartridge capacity (ml) The LK catalogue lists a 400ml Chem-Granite cartridge. Adjust to your actual cartridge if different.

Calculation basis and data source Chem-Granite uses the LK-supplied resin table (revision is not shown), for rotary-hammer-drilled, dry, non-overhead holes in concrete. Review the recommended hole diameter and depth, edit them if needed, then calculate. Edited dimensions use a table-based volume adjustment.

Planning estimate—not an engineering design

Final fastener or anchor type, load capacity, spacing, edge distance, embedment, resin quantity and installation method must follow the current manufacturer data, approved project design, substrate condition and responsible engineer’s requirements.