I heard this repeatedly across multiple airings of a Barack Obama television ad in the past two days.

Problem:
The second noun was mispronounced, and I misspelled it to match the mispronunciation.

Explanation:
The TV advertisement was for U.S. presidential candidate Barack Obama, and it focused on energy issues.

The complete sentence was “The hands that install rooves can also install solar panels.”

I wondered whether I misheard the voice-over announcer, so I carefully listened to him say “rooves” in the second and subsequent airings.

It is a fairly common English blunder to pronounce the plural of the noun “roof” as “rooves”.

Solution:
“The hands that install roofs …”