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The spec to demand in writing
Choose your load family and service. Get a specification block with published fabric values, construction requirements and reception checks. It puts the fabric weight you require in writing; measuring the delivered fabric checks whether the order was met. Paste the block into any request for quote, ours or anyone else's.
Your loads
Decides the drop. Leave empty to keep the drop as an open line on the block.
Nothing here is estimated: every value in the block is published, with its source stated.
The block to paste into your RFQ
Copied.
This browser could not keep the block for the quote. Copy or save it and paste it into your request.
First personal reply within 2 business days, with clarifying questions or next steps.
This tool covers flatbed tarps. For hay, use the round bale stack size calculator and the hay tarp fabric and fixing specifications.
Why these exact values
The values in the block are the published reference values for standard 18 oz coated vinyl tarp fabric, as published by US fabric vendors (read 2026-08-16). They are the numbers a scale and a pull test can verify at reception, which is exactly why they belong in writing: Fabric under 16 oz lets water through; 18 oz takes the abrasion. The buyer finds out at the customer's dock, not at purchase.
The construction rule that separates serious from throwaway build: High-frequency welded seams for watertightness; hardware sewn on webbing, never on bare fabric.
Our sourcing enquiries also returned lighter fabric options. Those are factory claims we have not verified against a published spec sheet, so this tool does not write them into a spec: if your case genuinely calls for lighter fabric, the honest path is a sample verified on a scale before the order, and we say so on the quote.
Fabric and dimensions are separate decisions. Use the flatbed tarp size guide to confirm width, side drop and end flaps before attaching this block to a quote.