You want the curve to face down wherever possible, so it does not retain water and increase the potential for slippery algae, moss and rot. This diagram shows how timber shrinks differentially depending on the grain direction and the orientation of the board within the log it was cut from. https://media1.britannica.com/eb-media/19/67719-004-A5F7ECED.jpg

Refurbished master bedroom with as much of use of timber as possible. Whangaparaoa, Auckland, New Zealand

Hello All, Forté is a Timber Flooring Specialist based in NZ with showrooms in Auckland, Wellington, and Queenstown. We work with professionals and homeowners, and we work alongside experienced installers focussing on glue-down installation to ensure a premium and long-lasting result. Feel free to reach out discuss your project with the team on 0508356677.

Hi Alex, some of the cracks look quite concerning especially those with the larger cracks. I suspect the cracked bearers are somewhat compromised. Hard to really judge based only off photos alone. Happy to help, if you would like to discuss further. Philip (Structural Engineer, 6 years experience in residential projects)