G and J Posted February 4 Posted February 4 If they go under the underlay what function are they performing? I guess if the underlay is left loose the water still gets past the horizontal battens but why not just put the underlay under the vertical battens?
makie Posted February 4 Posted February 4 Unsure, we always go over the felt in Scotland. The felt is supposed to have a slight sag so it doesn't really matter either way.
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