Roof Vent Question

I tried to search the forum to see if this topic was anywhere else so I apologize if this is a repeat.

I have a new house (1 year old). I was up on the roof yesterday and I noticed that the roof vent (sorry if that is the wrong terminology) is capped. I should also add that I have several "inside" vents throughout the house under the sinks and in the walls.

Is this normal? I seem to remember someone telling me they do this during construction but are supposed to remove the cap. The cap seems to be sealed on there (PVC type pipe).

On the roof Just cut the cap off as close to the cap as possible and you will be all set. Use a sawsall or similar.

Are the inside vents capped also or is there a valve on them?

Thanks for the information.

About the inside, I assumed that they were not sealed as they had a sort of ventilated cap/covering on them, but now I think I need to double check.

Also, I am on a septic system if that would make any difference.

Are these vents inside Studor vents? If so, you need at least one vent to the outside.

Call the builder and the building inspector, both of which seem to have missed this in their final inspection.