not necessarily, particularly if the "topsoil" is just whatever was dug up where construction was planned - no way to "reduce" weeds when you turn up soil that's been undisturbed for years, everything that's buried gets spread about, if it's weed seed [usually], you pull'em!

you're better off to build the health of your own soil if possible, adding as much organic material as you can

Bill

Other than the weed problem would it be a good base soil?

Proudgm asks:

"Other than the weed problem would it be a good base soil?"

The best "base soil" is the soil you already have IMO. By importing so called "top soil" there is no way for you to know what that soil contains until you have it in your possession. If you were to buy "top soil" from me it would be red Georgia clay riddled with rocks. What is suggested is that one amends their present soil with organic matter (compost) to create a fertile garden soil. By doing this, the owner knows exactly what the soil contains and what needs to be done to improve this soil. Also, money spent on an unknown soil can be put to better use in the garden or saved altogether.

Options one may consider are creating a lasagna garden, making compost, or amending the soil in other ways. If you are starting out in gardening and are not sure exactly what kind of soil you are dealing with a soil test may be in order. Rest assured someone will be along shortly to tell you exactly what one can do in that regard.

You fail to mention what area you live in or what kind of soil you presently have; this information would be helpful. Lacking that information, this is the best I can offer at this timeÂ

Blutranes

"Top soil" is simply the top 4 inches of soil from someplace. There is no other meaningful definition. What you really need to do is get some good organic matter, compost, into the soil you already have which will do more for your garden then any soil you could buy.