For thicker slabs, which are between 4 to 6 inches (10 to 15 cm), expect to pay about 1 USD more per square foot. And if you have your slab delivered by your supplier and the truck cannot reach the delivery space, you might have to pay for a pump truck at an additional cost. Buy concrete from home hardware stores or local independent concrete suppliers. For small slabs of concrete, use a piece of chalk to mark of the region that you need to cut. Either freehand the line or place a set square onto your slab and mark along the straight edge with your chalk. Stick with blue and white chalk—other colors are better suited for projects that take longer than 1 week. When you're cutting concrete that is already poured and finished, use a chalk line to mark the region. Get a friend to hold one end while you hold the other and run the line over the region to be cut. Lift the line simultaneously from each end and slap it to the ground. Alternatively, you can freehand a line using a piece of chalk—just be sure to make it as thick as possible.  Purchase chalk lines from home hardware stores. This simple tool is a reel of string that is coated with chalk and can be used to mark long, straight lines more accurately than free-handing. Use blue and white chalk if you want the lines to last about 1 week. For longer projects, use orange, yellow, or green for a 2 or 3-week lifespan, and red or black for a 2-month lifespan.
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One-sentence summary -- Purchase concrete slabs as thick as 6 inches (15 cm). Mark off the region to be cut with a piece of chalk. Designate the area of finished concrete to be cut using chalk lines.

Q: Using a measuring tape, measure 35 inches (89 cm) up from the bottom of the roof and make a mark with chalk. The measurement of 35 inches (89 cm) is the default measurement used by most roofing professionals. Use a ruler or meter stick to draw the chalk line across the roof. Avoid using eaves as guides as they are not necessarily placed at the same height across the roof. Use a trowel to scoop up the roofing cement. Spread the roofing cement along the edges of your roof so it’s about 1⁄8–1⁄4 inch (3.2–6.4 mm) thick. You can get roofing cement at the local hardware or building supplies store.  Apply the cement in stages. Do the bottom part of the roof before you start working on that section, apply it to the middle before you start working there, and so on. Use the chalk lines as the borders of each section. Always wear gloves when working with roofing cement. Read the instructions on the side of the roofing cement container before you begin. The rolled roofing should reach the chalk line when you lay it down and should stretch from 1 side of the roof to the other. You'll need to use plenty of pressure with the razor knife to cut the rolled roofing material. As you place the rolled roofing down, stretch it to get rid of wrinkles and creasing. Push the rolled roofing down into the wet cement to secure it to the roof. The first layer should cover the roof as far as the chalk line. Make sure you use a strong hammer and 1 inch (2.5 cm) roofing nails. Hammer the nails in at 10 inches (25 cm) intervals across the roof. Ensure that you hammer the nails properly into the roof, don't leave the nails sticking up above the layer. Be careful when working with a hammer and nails on a roof. Make sure you have a stable grip on the roof. Use your measuring tape again to measure up 32 inches (81 cm) above the first layer. The shorter length is because you'll be laying part of the second layer on top of the first layer. Draw the chalk line across the length of the roof. Get your trowel and another scoop of cement and apply it on the roof below the second chalk line. Once the cement is spread across the roof, it's time to place the second layer down. As mentioned above, place the first 6 inches (15 cm) of the second layer on top of the first layer.  When nailing the second layer into the roof, make sure you nail the first and second layers together. Repeat this process for the rest of the roof. When you have all of your layers applied and your roof is covered in rolled roofing, use cement to cover your nails. This will seal the nails into the rolled roofing. Use your razor knife to remove any excess rolled roofing. Take special note of the corners and edges of the roof. When you're finished trimming, test the edges to see if you can lift them. If you can lift the edges, use some more cement to seal them in place. Have another look at the roofing and use a brush to remove any excess dirt or other materials. There shouldn't be that much dirt on the roof at this point of the process. Once the roof is clean, you're finished.
A: Mark a chalk line to identify the end of your first layer. Apply roofing cement to the roof. Cut the rolled roofing to the right size using a razor knife. Place the first layer of rolled roofing on the roof. Hammer nails into the rolled roofing to secure it. Measure and mark another chalk line above the first layer. Apply roofing cement and secure the second layer to the roof. Cover the nails with cement to secure them in place. Trim the edges of the layers and seal the edges. Clean the rolled roofing before you finish.

Article: Even though some recipes use kitchen ingredients, they are not being prepared for consumption. Magic mud is meant to be used as an experiment and a toy, not a snack. Supervise young children so that they do not consume the magic mud. Ideally, you will do these experiments outside. Magic mud can get rather messy. If doing the experiment outside isn't an option, lay down a piece of plastic or cardboard to do the experiment on. This will make cleanup much easier. When cutting potatoes, be cautious. Knives and food processors are both dangerous if they aren't used properly. Let an adult do the cutting, or do the cutting under the supervision of an adult.
Question: What is a summary of what this article is about?
Avoid eating the magic mud. Designate a space for magic mud. Use all tools cautiously.