WikipediaThe Wikipedia article about Trimethylsilanoltrimethylsilanol says the following:
Trimethylsilanol is a weak acid with a $\mathrm{p}K_\mathrm{a}$ value of 11. The acidity is comparable to that of orthosilicic acid, but much higher than the one of alcohols like tert-butanol ($\mathrm{p}K_\mathrm{a}$ 19).
Why is it so? A silicon atom is more electropositive than a carbon atom, therefore the conjugatedconjugate base willshould be more destabilized by the +I effect of the $\ce{Si(CH3)3}$ group compared to the $\ce{t-Bu}$ group.