When the entire wall is built, the individual bricks are part of a wall system where a single brick cannot move without putting tension on the surrounding bricks. Its done that way to prevent the brick from "floating" out of position while the cement is still "wet" ie not cured and hardened yet. A wall built with bricks frog up is stronger than a wall built with bricks frog down. There is also debate regarding whether frogged bricks should be laid frog-up or frog-down. Not all are laid this way as piecework brickies will lay them the easier (quicker) way, i.e. I found this brick with the mortar still attached, and gaps showing the void. The vast majority of bricks made with frogs are for the building industry. frog down. So maybe the name originates from the inhabitants. The depression provided in the face of a brick during its manufacturing is called frog in bricks. Bricks have Frogs. The mortar inside the frog of bricks forms a keyed joint between the brick and the mortar, thus negating any relative movement between two layers of brick and providing stability to the brickwork. Also, if you put the Frog facing up, you will need to use more mortar than really is necessary. Refractory bricks were not made with frogs as a tight fit between bricks was required and with the minimum of cement being used. Frog Brick When bricks are laid in a bed of mortar, the mortar squeezes into the holes which, when dried, locks the bricks into place. If the bricks you are using don’t have holes through them but have an indentation (known as a frog), lay the bricks with the frog at the top.The last course of bricks can be laid with the frog at the bottom to give the brickwork a smooth finish on the top.. Lay one brick at each end of the course with a string line stretched between them along the top edge. Brick laid frog-down – Frogged bricks should be laid frog-up, so the frog fills with mortar and provides a good bond. 5. Brick Frog is a minor supervillain on The Venture Bros. 1 Character History 2 Episode Appearances 2.1 Season 4 2.2 Season 5 2.3 Season 6 2.4 Season 7 3 Appearances in Other Media 4 Trivia 5 Gallery 6 References Brick Frog is a supervillain with no special powers, whose only villainous skills are brick throwing and frog being. The mortar is filled in the frog while laying the bricks in masonry work to help in bonding and acting as a shear key against horizontal loads. Frog bricks should be laid frog up. The "Frog" indent should be facing down. frog up is the right way, some bricks have a weather face, if layed frog down will cause problems later. Furthermore, when laying bricks does the frog go up or down? The brick frog is the indentation in a brick, normally where the maker’s name is stamped. Fill all frogs with mortar…” This maximizes strength, stability and general performance of the brickwork. Laying frog-down is easier and uses less mortar, but the resultant voids in the frog provide a poor bond. My family used to leave bricks in the garden, indentation down, propped up, in order to provide safe havens for wildlife, possibly frogs. If the frog is laid down, the load is forced to the outsides of the brick. Why frog should be laid upwards: When the frog is laid upwards, the load is evenly spread throughout the width of the brick all the way down to the foundations. Never heard of this but a wall should always be built frog up so the frog is always filled with mortar on the next spread.If it is walled frog down, rainwater will soak through the brick,settling in any voids and in winter will freeze blowing the face off the brick. 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