However, if you wish to take away the ceiling and be able to see roof, then another system should be used to tie down the rafters to the walls and stop them from spreading.
Fodd bynnag, os ydych am dynnu'r nenfwd i ffwrdd ac am fedru gweld y to, dylid defnyddio system arall i glymu'r ceibrennau wrth y waliau a'u hatal rhag ymwasgaru.