Jadnashua
Retired Defense Industry Engineer xxx
From what I hear, in many places, a house your size would require a minimum of a 1" water line, so you're short just there.
It may be possible to fairly easily make the connection to the sprinkler takeoff all copper with no restictions, but you won't get 11gpm at a safe velocity through the pipes. A common max flow rate is often given at around 6'/second and with a full 3/4" ID pipe (which you don't have), that only comes to about 8gpm. Going faster than that can cause cavitation damage to the piping system, noise, and is not good.
If the sprinkler system, as designed by the builder, can only reach 1/3 of the lawn, then there's a breach of contract. Check the max limits of small claims court in your area.
In your locale, what size water supply line is required by code?
It may be possible to fairly easily make the connection to the sprinkler takeoff all copper with no restictions, but you won't get 11gpm at a safe velocity through the pipes. A common max flow rate is often given at around 6'/second and with a full 3/4" ID pipe (which you don't have), that only comes to about 8gpm. Going faster than that can cause cavitation damage to the piping system, noise, and is not good.
If the sprinkler system, as designed by the builder, can only reach 1/3 of the lawn, then there's a breach of contract. Check the max limits of small claims court in your area.
In your locale, what size water supply line is required by code?