No submissions information on their site, but they do have contact information.
From the publisher: “As publisher of ROOF BOOKS and SEGUE BOOKS, SEGUE now has over 70 titles of contemporary poetry and criticism in print. In the late 1970s/early 80s, SEGUE published the poetry journal ROOF and distributed the critical journal L=A=N=G=U=A=G=E, two of the early seminal publications of the “language” poetry movement. Roof brings new writing to print in handsome, perfect bound books and now in online formats such as POD, PDF, Adobe eBook, and MS Reader. Roof Books are available in online and print format at Roof.com or in print format through our distributor SPD”