We didn't seal up the floorboards themselves, rather the gap between the floorboards and the skirting boards around the whole room. For this we used a type of plaster that is designed for large cracks. It came in a squeeze out tube. You can buy it and mix yourself which is cheaper but I was way too lazy to try hehe. My dad told me to use silicone along them since it is more flexible for when the floorboards expand but I tried this and it was very difficult to do and the result was messy- since Im not experienced with that kind of thing. So I found the plaster worked a lot better and gave a clean unnoticeable finish. If you do have gaps in between the actual boards there is something you can buy to seal those. I'm not sure what it's called though I just know that in several places around our old house someone had done that. Good luck, we haven't seen a single carpet beetle in a LONG TIME!
Carpet beetles + bedbugs + clutter = help!! - Page 2
We had a carpet beetle problem earlier in the year.
Yes, clutter is a big part of the problem. They like fabric, though also I think some grains (cereals, rice) so check your pantry too, just in case.
We had EXCELLENT results using a product that is 100% orange oil. It wiped out all the bugs. It smelled great - because it's oranges (or maybe tangerines), and not "orange scented" or any of that crap, it was the real thing. Let me know if you want me to dig out a link for this product. It will kill the bugs (and it's safe to use around children, pets and even FOOD) but you have to spray in the right places, of course. DH is something like a bug genius, he watches them and he can figure out where the nest is, spray a concentrated area, and bam! They're gone. He did that, and then noticed just 2 bugs a day in another area, got those, and we've not seen another carpet beetle again.
Because the nest was in a wall that shared a wall upstairs with my closet (and my closet shares another wall with DH's closet) we emptied the closets 100%. We did a major, major purge (which I can't think about because I got rid of some bigtime sentimentals!!) and sealed all rest of the clothes into garbage bags (with liberal sprinklings of borax right in the bags, to suffocate any bugs that were in the clothes) and put the bags on our back porch. Honestly, we're still working our way through the bags again; I wash the clothes in hot water with my usual mixture of borax, washing soda and soap. If I had a chest freezer, I'd freeze anything I couldn't wash, but I think I might take a chance and just shake the borax off of those items and hang them back up eventually
Carpets: we sprinkled liberally with borax, let the Borax sit for 48 hours and then vacuumed. VERY IMPORTANT: eating borax is very toxic to pets!! If you have cats, you'll need to explore other options. I don't think cats will just eat the borax but if they walk on the carpet and then clean their paws later, it could be harmful. I don't think tiny amounts will hurt them but I heard of a guy who mixed a cup of borax with some food and put it out for bait for... I forgot what ... but anyway his cat ate it and died.
We have two cats and we banished them outside for the two days we let the borax do its work.
I hope some of that helps. I've been there. Good luck.
We had a bed bug experience whena houseguest brought them in while back. Fortunately, we caught it very early and have not seen any sign of them for over a year.
We had a pest company come in. We also pulled up every baseboard in the house and squirted diatomaceous earth behind them with a syringe, then put baseboards back (wearing a mask as the stuff is bad to inhale, though not chemically toxic). An unexpected result - we are pretty much bug free now! We always would have the odd beetle or sowbug or cockroach type bug here and there - but the DE in the baseboard cracks put a stop to all of that.
If you are not sure what you have, bedbugger.com is a great free resource. Post a pic there - they will ID. I hope it isn't bedbugs!