# GRP Laminate Skin Thickness Calculator - TheNavalArch

**URL:** <https://forum.gcaptain.com/t/grp-laminate-skin-thickness-calculator-thenavalarch/54084>\
**Category:** Professional Mariner Forum\
**Created:** [February 5, 2020, 11:50pm UTC](https://forum.gcaptain.com/t/grp-laminate-skin-thickness-calculator-thenavalarch/54084 "2020-02-05T23:50:04Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![thenavalarch](https://avatars.discourse-cdn.com/v4/letter/t/2acd7d/32.png) [@thenavalarch](https://forum.gcaptain.com/u/thenavalarch)\
**Post date:** [February 5, 2020, 11:50pm UTC](https://forum.gcaptain.com/t/grp-laminate-skin-thickness-calculator-thenavalarch/54084/1 "2020-02-05T23:50:04Z")

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We are pleased to launch a new product - [GRP Laminate Skin Thickness Calculator](https://www.thenavalarch.com/software/boat-design-operations/frp-boats/grp-laminate-skin-thickness-calculator/)

 ![](https://us1.discourse-cdn.com/flex016/uploads/gcaptain_maritime_forum/original/2X/d/daf379704f7d746f8df4a95fbbc42ff631c4c58f.jpeg)

This app helps the user to design the laminate layers of an FRP boat  
From the rules/design, you may have achieved the total cured thickness needed for your laminate  
Ending up with a thinner laminate means weaker laminate and thicker laminate means excess material is being spent  
The user can try out various combinations of CSM and WR reinforcements to achieve the thickness accurately, along with other mechanical properties

The App gives the following

- The collective thickness (except the gelcoat) for the number of layers of reinforcements used
- Ultimate tensile strength (N/mm2)
- Tensile modulus (N/mm2)
- Ultimate compressive strength (N/mm2)
- Compressive modulus (N/mm2)
- Ultimate shear strength (N/mm2)
- Shear modulus (N/mm2)
- Ultimate flexural strength (N/mm2)
- Flexural modulus (N/mm2)

**References**

Indian Register of Shipping - Rules and Regulations for the Construction and Classification of High-Speed Crafts and Light Crafts

A video preview of the app is in the link below:

To learn more, please click on the image above or the link below.

> **[GRP Laminate Skin Thickness Calculator - TheNavalArch](https://thenavalarch.com/software/boat-design-operations/frp-boats/grp-laminate-skin-thickness-calculator/)**
>
> Purpose This excel sheet helps the user to design the laminate layers of an FRP boat From the rules/design, you may have achieved the total cured thickness needed for your laminate Ending up with a thinner laminate means weaker laminate and thicker...

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**Author:** ![powerabout](https://avatars.discourse-cdn.com/v4/letter/p/43a26b/32.png) [@powerabout](https://forum.gcaptain.com/u/powerabout)\
**Post date:** [February 6, 2020, 12:07am UTC](https://forum.gcaptain.com/t/grp-laminate-skin-thickness-calculator-thenavalarch/54084/2 "2020-02-06T00:07:08Z")

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does it only work for CSM and Woven?

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**Author:** ![thenavalarch](https://avatars.discourse-cdn.com/v4/letter/t/2acd7d/32.png) [@thenavalarch](https://forum.gcaptain.com/u/thenavalarch)\
**Post date:** [February 6, 2020, 1:12pm UTC](https://forum.gcaptain.com/t/grp-laminate-skin-thickness-calculator-thenavalarch/54084/3 "2020-02-06T13:12:46Z")

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Apart from CSM and WR, another variety used is veil mat - which does not generally contribute to strength but is used as a first layer before heavier clothes are used.  
Ropes are used to fill up nooks and corners.  
Basic reinforcements are CSM and WR.

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**Author:** ![powerabout](https://avatars.discourse-cdn.com/v4/letter/p/43a26b/32.png) [@powerabout](https://forum.gcaptain.com/u/powerabout)\
**Post date:** [February 6, 2020, 1:55pm UTC](https://forum.gcaptain.com/t/grp-laminate-skin-thickness-calculator-thenavalarch/54084/4 "2020-02-06T13:55:33Z")

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_"Basic reinforcements are CSM and WR_."  
for boats built in the 70’s