If the beam is raw wood, you can treat all 4 sides using Boracare at 1:1 ratio. Boracare will penetrate into the wood and will kill active Powder post beetles.
Since you have droppings then that means dry wood termites is your issue and you probably live in CA or FL. If you see droppings then there are "kick out"holes which you should be able to find on the wood where the termites that are inside the wood are kicking out their pellets onto the floor. This will help you zero in on the wood that you are treating.
Bora-Care is usually the preferred choice if most of the wood is exposed and it is raw wood you are treating, meaning it is not painted, stained, or sealed, it is just normal wood. Bora-Care is made only for wood, and you do not have to know exactly where the termites are for it to work which is a plus. Bora-Care is sprayed evenly over all exposed surfaces of the wood and actually penetrates through the entire piece of wood. When the termites in the wood try to consume the wood after it has been treated, they ingest the Bora-Care with the wood and die. No matter where they are in the wood the Bora-Care will find them as long as you treated the exposed wood that you can see. The other main benefit is that Bora-Care stays in the wood forever, so you will not have to worry about termites or beetles infesting the wood that you treated ever again.
Yes, Boracare can be sprayed on wood that is in its natural state. Once it has dried, you can saw, install and apply paint or finish to the wood.
It is recommended that you keep pets and children out of the area treated with Boracare until the product has dried completely and any odor has dissipated.
Unfortunately, we currently only ship within the United States.
Bora-Care cannot be applied in a thermal fogger or a ULV fogger. It can be applied to raw wood by being foamed in the wall void (foaming concentrate and foam applicator equipment needed), painted on the surface, or in a sprayer. You will mix the Bora-Care concentrate in hot water in a separate container and mixed first. Then you will apply in your sprayer. It is a very thick liquid and should not be mixed directly in the spraying equipment (this could cause equipment damage) and will clog most fogging equipment.