Methods of manufacturing load-supporting mats for use with interfacing gap seal members

1. Method of manufacturing a plurality of mats useful with a plurality of frame style seal members in a load-supporting surface, each frame style seal member having front and rear portions and being configured to be coupled to one of the mats and provide a liquid-tight seal across a gap formed between adjacent mats in the load-supporting surface, the method comprising:

at least one milling machine or router forming a first elongated groove in a first outer edge of at least a first side of each among at least first and second stepped-configuration, reversible mats, the first outer edge of each mat extending at least partially around a first perimeter of the mat, the first elongated groove of each mat being configured to seat the rear portion of at least one frame style seal member, each mat being useful at an outdoor worksite and configured to support the weight of people, vehicles and equipment thereupon;

at least one milling machine or router forming a second elongated groove in a second outer edge of at least the first side at least the first and second mats, the second outer edge of each mat extending at least partially around second perimeter of the mat, wherein the first and second outer edges of each mat are offset relative to one another depth-wise so that the first outer edge on at least the first side of each mat is disposed above and outwards of the second outer edge on at least the first side of each mat when the mat is right-side-up, the second elongated groove of each mat being configured to seat the rear portion of at least one other frame style seal member; and

each among the first and second grooves of at least the first side of at least first and second mats causing the front portions of the frame style seal members seated therein to extend into a respective gap formed between the first and second mats when the first and second mats are positioned adjacent to one another in the load-supporting surface with the first mat right-side-up and the second mat upside-down, abut at least one frame style seal member seated in the first or second groove of the first side of the adjacent mat and form a liquid-tight seal therewith across the corresponding gap.

2. Method of manufacturing a plurality of mats useful with a plurality of frame style seal members in a load-supporting surface, each frame style seal member having front and rear portions and being configured to be coupled to one of the mats and provide a liquid-tight seal across a gap formed between adjacent mats in the load-supporting surface, the method comprising:

at least one pre-formed mold forming a first elongated groove in a first outer edge of at least a first side of each among at least first and second stepped-configuration, reversible mats, the first outer edge of each mat extending at least partially around a first perimeter of the mat, the first elongated groove of each mat being configured to seat the rear portion of at least one frame style seal member, each mat being constructed at least partially of thermoplastic material, useful at an outdoor worksite and configured to support the weight of people, vehicles and equipment thereupon;

at least one pre-formed mold forming a second elongated groove in a second outer edge of at least the first side at least the first and second mats, the second outer edge of each mat extending at least partially around second perimeter of the mat, wherein the first and second outer edges of each mat are offset relative to one another depth-wise so that the first outer edge on at least the first side of each mat is disposed above and outwards of the second outer edge on at least the first side of each mat when the mat is right-side-up, the second elongated groove of each mat being configured to seat the rear portion of at least one other frame style seal member; and

each among the first and second grooves of at least the first side of at least first and second mats causing the front portion of the frame style seal member(s) seated therein to extend into a respective gap formed between the first and second mats when the first and second mats are positioned adjacent to one another in the load-supporting surface with the first mat right-side-up and the second mat upside-down, abut at least one frame style seal member seated in the first or second groove of the first side of the adjacent mat and form a liquid-tight seal therewith across the corresponding gap.