FIG. 1 is a front perspective view of the radiant floor heating underlay board in accordance with the subject design;
FIG. 2 is a front elevational view of the radiant floor heating underlay board of FIG. 1;
FIG. 3 is an end view of the radiant floor heating underlay board of FIG. 1;
FIG. 4 is a side view of the radiant floor heating underlay board of FIG. 1;
FIG. 5 is a rear elevational view of the radiant floor heating underlay board of FIG. 1;
FIG. 6 is an opposite end view of the radiant floor heating underlay board of FIG. 1; and,
FIG. 7 is an opposite side view of the radiant floor heating underlay board of FIG. 1.