> For the complete documentation index, see [llms.txt](https://docs.diysauna.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.diysauna.app/be-aware/horizontal-inner-furring-strips.md).

# Horizontal, inner furring strips

### Problem

The horizontal, inner furring strip (for vertical paneling) does not account for window rough openings. As a result, the material list for inner furring strips is incorrect.

This issue applies only to horizontal furring strips (for vertical paneling); there is no such problem with horizontal paneling.

<figure><img src="/files/tenQRNmNyKXcdo9Vxw5D" alt="" width="563"><figcaption><p>Omission of the window opening in the visualization and summary</p></figcaption></figure>

### Solutions

1. Adjust the quantity of materials.