The issue is not with how it's laid, but with how accurately the boards have their tongue and grooves machined. If the boards are from separate batches, small differences in tongue and groove heights can produce a lip on the edge of boards. Fortunately with pine, it shouldn't be too tricky to sand flat.
The issue is not with how it's laid, but with how accurately the boards have their tongue and grooves machined. If the boards are from separate batches, small differences in tongue and groove heights can produce a lip on the edge of boards. Fortunately with pine, it shouldn't be too tricky to sand flat.