I did the drilling method for termite prevention but it's not effective. I have to get the guys to come back every 4 months to do a check as termites return. Found out that whenever my neighbour (who doesn't use any pest control treatment) uses termite powder to treat termite-attacked zone, those pest would pack their bags and family, move over to my territory!!!!!
And after all the drilling, I have ugly patches of holes on my tiles!!!! Everytime I see those patches, my heart aches!!! And it's been 6 years since my house had the treatment. I was given a warranty of 7 years, but within the first year, I had my next attack!!!
So if there's other better method, consider them and NOT drilling!!