What is the best way to treat solid wood against humidity?
Ideally don’t let it get near humidity.Summer humidity and central heating are death to fine furniture.Open windows and let the moisture equalise in summer.Growing a large pot plant near a good table say will help the wood stabilise,again down to humidity.Maintain the original finish,whether it’s oil based french polishing or stain and varnish,any lack of finish lets moisture in and out,Bee’s wax,if appropriate helps.The trick is to prevent or slow the transpiration,even olive oil.and don’t keep the wood exposed to direct sunlight.What’s good for antique furniture is good for all wood,it’s difficult to be more precise without knowing exactly you intend,For eg,Pva is commonly used on the end grain of new sawn timber to prevent rapid dry out and splits and shakes.All wood expands and contracts in response to heat/humidity,in fact it must.Good timber selection and design is as important,if not more so for any projest involving wood .For a more accurate question I would need to know,Wood t